How is that different then what semi-pelagianism teaches?
"Semi-Pelagianism" (known as Masillians during the Second Council of Orange) s the idea that the beginning of faith comes from the free will of nature, not God's grace, and that the essence of "prevenient grace" consists in the preaching of the Christian doctrine of salvation. Thus, the teaching claims that man can come to God without grace, but of a "good free will".
The Second Council of Orange (raised to the level of an oecumenical council, having full support of the Apostolic See) refutes that idea. In twenty-five canons "...the entire powerlessness of nature for good, the absolute necessity of prevenient grace for salutary acts, especially for the beginning of faith, the absolute gratuity of the first grace and of final perseverance, were defined, while in the epilogue the predestination of the will to evil was branded as heresy" (Source: cf. Denzinger-Bannwart, nn. 174-200)
This was further set down at the Council of Trent while defining the Church's belief on justification contra Protestantism:
Justification receives its first impulse from the supernatural grace of vocation (absolutely independent of man's merits), and requires an intrinsic union of the Divine and human action, of grace and moral freedom of election, in such a manner, however, that the will can resist, and with full liberty reject the influence of grace. (Trent, l.c., can.iv: "
If any one should say that free will, moved and set in action by God, cannot cooperate by assenting to God's call, nor dissent if it wish. . . let him be anathema"). By this decree the Council not only condemned the Protestant view that the will in the reception of grace remains merely passive, but also forestalled the Jansenistic heresy regarding the impossibility of resisting actual grace. (Source: Catholic Encyclopedia on Justification)
Catholics hold simultaneously (not fully understanding the mystery of the mechanics) that God's grace is absolutely necessary at EACH step of Justification and Sanctification, AND that man CAN refuse this grace at any particular point. St. Paul makes this clear in the mysterious cooperation between God and man in Phil 2:12-13
"...continue to work out your salvation with fear and trembling, for it is God who works in you to will and to act according to his good purpose."
God gives man commandments and expects us to obey them. This is the indication to the Church Fathers throughout the ages that man does retain free will and ability to refuse the graces of the Spirit.
Does the RCC teach man can seek God and on what terms does man seek God?
Yes, man is expected to seek out God. The Psalms mention this quite often, for example, Ps 9:10; 14:2; 22:26: 27:4 and so forth.
Here is an example:
Seek good, not evil, that you may live. Then the LORD God Almighty will be with you, just as you say he is. Amox 5:14
Naturally, one must take into account that God is somehow behind this "seeking", as it is God who moves our will and desire to seek Him. We don't know a mathematical formula to explain "how much does God do and how much do I do" or any such thing. We do know we do not seek Him without Him. As St. Augustine says, (paraphrasing), "God, who made man without man's help, nevertheless does not save man without man" Somehow, we are expected to NOT disdain His graces to move our will.
In summary, we are expected to seek God - but God in His love moves our will, which remains intact. Remember, Jesus said "
without me, you can do nothing good" John 15:5. Thus, we do not believe that we can come to God without God. Thus, Catholics are not Semi-Pelagian.
Regards