Perhaps you should try some spelling variations:
taking courses » training courses
courses tool » courses moocs, course book, course goal
risk taking » risk sharing
wei yang » pei yang, wei wang, wei yang's
dong bin » dong di, dann bin
tool ghi » tool chip, tool di
y a » y la

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: ((wei yang) OR (((dong bin) OR (dong sin)))) y a risk taking courses tool ghi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wei yang) or (((dong bin) OR (dong sin)))) y a risk taking courses tool ghi ;~".
• Adding a wildcard symbol may retrieve word variants: ((wei yang) or (((dong bin) OR (dong sin)))) y a risk taking courses tool ghi ;*.