Perhaps you should try some spelling variations:
learning gains » learning goals
task learning » tasks learning
done using » line using, move using
wang yang » wang yan, wang liang, wang yanling
cong sau » cong shu, wong sau, cong sun
ye a » yet a, me a, y a
e a » et a

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((done so) or (done using))) or (wang yang)) ((ye a) or (e a)) task learning gains cong sau ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((done so) OR (done using))) OR (wang yang)) ((ye a) OR (e a)) task learning gains cong sau ;.
• Adding a wildcard symbol may retrieve word variants: ((((done so) or (done using))) or (wang yang)) ((ye a) or (e a)) task learning gains cong sau ;*.