Perhaps you should try some spelling variations:
learning costs » learning cost, cleaning costs, learning cross
costs among » costs along, customs among
wang liang » wang yang
liang yang » liang ying, wang yang, yang yang
among ers » among peers, among users, among east
can lost » can lose, can post, can boost
can cost » can costa, can post, chain cost

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang liang yang ((can lost) or (can cost)) learning costs among ers ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang yang ((can lost) OR (can cost)) learning costs among ers ;*.