Perhaps you should try some spelling variations:
among african » among africans, among american, among mexican
hua gene » human gene, hua ren, hy5 gene
yang lin » yang jin, wang lin, yang li
dong di » dong sin
lin man » lin nan, lin meng
man shu » tan shu
a gene » a genre, a gender, a gentle

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong di) or (among african)) ya ((hua gene) OR (a gene)) yang lin man shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong di) OR (among african)) ya ((hua gene) OR (a gene)) yang lin man shu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong di) or (among african)) ya ((hua gene) OR (a gene)) yang lin man shu ;".
• Adding a wildcard symbol may retrieve word variants: ((dong di) or (among african)) ya ((hua gene) OR (a gene)) yang lin man shu ;*.