Perhaps you should try some spelling variations:
teaching learning » machine learning
learning wong » learning among, learning work, learning working
sea teaching » sara teaching, team teaching, a teaching
wang liang » wang yang
dong bin » dong di, dann bin
wong yue » wang yue, hong yu

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: ((((dong bin) OR (wang liang))) OR (dong sin)) yi ta sea teaching learning wong yue ;~.
• Adding a wildcard symbol may retrieve word variants: ((((dong bin) or (wang liang))) or (dong sin)) yi ta sea teaching learning wong yue ;*.