Perhaps you should try some spelling variations:
changes made » changes a, changes due
yuan health » human health, iran health, urban health
health gain » health goals
yan yuan » yan guan, fang yuan, nan yan
yang jin » yang jun, ying jin, shang jin
yang jie » yang di, yang jui, yang xi
wang » wing, wan
tan » than

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

• Performing a fuzzy search may retrieve terms with similar spellings: (wang or lang) yan yuan health gain ((((yang jin) or (yang jie))) or (changes made)) hong tan ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wang OR lang) yan yuan health gain ((((yang jin) OR (yang jie))) OR (changes made)) hong tan ;.
• Adding a wildcard symbol may retrieve word variants: (wang or lang) yan yuan health gain ((((yang jin) or (yang jie))) or (changes made)) hong tan ;*.