Perhaps you should try some spelling variations:
china health » china's health, child health, capita health
health gain » health goals
wang yang » wang yan, wang liang, wang yanling
yang mind » yang cindy, yang jin, sang minh
hong than » hong tan, long thanh, hong hai
wang ban » wang yan, wang dan, bang bang
ying jin » yang jin, jing ji, yang jie

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang ban) OR (wang yang)) china health gain ((yang mind) or (ying jin)) hong than ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang ban) OR (wang yang)) china health gain ((yang mind) OR (ying jin)) hong than ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang ban) OR (wang yang)) china health gain ((yang mind) or (ying jin)) hong than ;".
• Adding a wildcard symbol may retrieve word variants: ((wang ban) OR (wang yang)) china health gain ((yang mind) or (ying jin)) hong than ;*.