Perhaps you should try some spelling variations:
among african » among africans, among american, among mexican
gene yang » gene bank
yang jie » yang jin, yang di, yang jui
jie meng » die menge, jie song, jui meng
meng shu » cong shu
ya a » y a, ye a, yu a
a a » a la
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 african)) ((ya a) OR (a a)) gene yang jie meng shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong sin) OR (among african)) ((ya a) OR (a a)) gene yang jie meng shu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong sin) or (among african)) ((ya a) OR (a a)) gene yang jie meng shu ;".
• Adding a wildcard symbol may retrieve word variants: ((dong sin) or (among african)) ((ya a) OR (a a)) gene yang jie meng shu ;*.