Perhaps you should try some spelling variations:
urban health » human health
health gap » health gaps, wealth gap, health gain
wang liang » wang yang
die urban » drive urban, vice urban, use urban
yang yang » wang yang, wang yan
wenn die » kann die
yang jin » yang jie, yang jun, ying jin

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

• Performing a fuzzy search may retrieve terms with similar spellings: wenn die urban health gap ((((wang liang) or (yang yang))) or (yang jin)) dang (hai OR haji) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wenn die urban health gap ((((wang liang) OR (yang yang))) OR (yang jin)) dang (hai OR haji) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wenn die urban health gap ((((wang liang) or (yang yang))) or (yang jin)) dang (hai OR haji) ;*".