Perhaps you should try some spelling variations:
enhanced learning » intended learning
wang learning » long learning, change learning, making learning
gao ying » yao yang, fan ying, ka ying
ying jin » yang jin, jing ji, yang jie
song hai » hong hai, shang hai, long han
tony a » tony h, tony j
a gao » a gay, a geo, a gap

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)) tony a gao ying jin ((song hai) OR (dang hai)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang learning) or (enhanced learning)) tony a gao ying jin ((song hai) OR (dang hai)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang learning) or (enhanced learning)) tony a gao ying jin ((song hai) OR (dang hai)) ;*.