Perhaps you should try some spelling variations:
enhanced learning » intended learning
wang learning » long learning, change learning, making learning
theory hua » theory human, theory how, theory 4a
ying jin » yang jin, jing ji, yang jie
jin kong » jin kang, jin song, king kong
hua li » bohua li

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang learning) OR (enhanced learning)) theory hua li ying jin kong (sar OR star) ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang learning) or (enhanced learning)) theory hua li ying jin kong (sar or star) ;*.