Perhaps you should try some spelling variations:
iran health » urban health, migrant health, german health
health gain » health goals
woman iran » woman can, women iraq
wan woman » man woman, woman woman, a woman
yan liang » yang liang, wang liang, you liang
shang hai » shang kai, dang hai, chang ha
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: wan woman iran health gain ((yan liang) or (yang jin)) shang hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wan woman iran health gain ((yan liang) OR (yang jin)) shang hai ;.
• Adding a wildcard symbol may retrieve word variants: wan woman iran health gain ((yan liang) or (yang jin)) shang hai ;*.