Perhaps you should try some spelling variations:
among american » among mexican, aging american
hua gene » human gene, a gene, hy5 gene
yang lin » wang lin, yang li, yang liang
yang jin » yang jie, yang jun, ying jin
meng shu » cong shu
hua ren » hua chen
dong » doing, long, done

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong sin) or (among american)) ya ((hua gene) or (hua ren)) ((yang lin) or (yang jin)) meng shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong sin) OR (among american)) ya ((hua gene) OR (hua ren)) ((yang lin) OR (yang jin)) meng shu ;.
• Adding a wildcard symbol may retrieve word variants: ((dong sin) or (among american)) ya ((hua gene) or (hua ren)) ((yang lin) or (yang jin)) meng shu ;*.