Perhaps you should try some spelling variations:
change learning » exchange earnings, enhanced learning, machine learning
learning theory » learning through
theory 4.3 » theory 2.3, theory 4.1, theory 3.3
yang jie » yang di, yang xi, yang yi
yang jui » yang judy, yang di, yang xi
yang jin » yang jun, ying jin, shang jin
4.3 li » 4.3 ali, 4.3 lid, 4.3 liq

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: change learning theory 4.3 li ((((yang jie) OR (yang jui))) OR (yang jin)) kang (sar OR star) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "change learning theory 4.3 li ((((yang jie) OR (yang jui))) or (yang jin)) kang (sar or star) ;~".
• Adding a wildcard symbol may retrieve word variants: change learning theory 4.3 li ((((yang jie) OR (yang jui))) or (yang jin)) kang (sar or star) ;*.