Perhaps you should try some spelling variations:
learning tim » learning time, learning theme, learning tool
learning tom » learning time, learning tool, learning tony
yang mind » yang cindy, sang minh, tang min
chia lan » china land, china law, chia wen
yang jin » yang jie, yang jun, ying jin
hong hai » shang hai, zhong tai, dang hai

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: long ((learning tim) OR (learning tom)) chia lan ((yang mind) OR (yang jin)) hong hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "long ((learning tim) OR (learning tom)) chia lan ((yang mind) or (yang jin)) hong hai ;~".
• Adding a wildcard symbol may retrieve word variants: long ((learning tim) OR (learning tom)) chia lan ((yang mind) or (yang jin)) hong hai ;*.