Perhaps you should try some spelling variations:
malawi rural » mali rural, malawi mutual, malawi human
genome scale » income scale, genome can
wan yanling » wang yanling, wang yangming, wang danning
scale among » scaled along, care among, share among
among zhong » among hong
yala human » data human, malawi human
zhong zhi » zhang zhi, hong ghi, zhong tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: wan yanling ((yala human) or (malawi rural)) genome scale among zhong zhi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wan yanling ((yala human) OR (malawi rural)) genome scale among zhong zhi ;.
• Adding a wildcard symbol may retrieve word variants: wan yanling ((yala human) or (malawi rural)) genome scale among zhong zhi ;*.