Perhaps you should try some spelling variations:
learning learning » teaching learning, learning teaching, measuring 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
kang hai » kang han, shang hai, kang tae
tony h » tony a, tony j
h gao » _ gao

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