Perhaps you should try some spelling variations:
human gene » human genome, human gender, human bone
yang liang » wang liang, yan liang, yang yang
hoang ghi » hong ghi
yan yang » yang yang, yao yang, dan yang
hua gene » a gene, hua ren, hy5 gene
hoang h » hoang _, hoang vu, hoang sy
wang » wing, wan, lang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan yang ((hua gene) OR (human gene)) yang liang ((hoang ghi) OR (hoang h)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan yang ((hua gene) OR (human gene)) yang liang ((hoang ghi) or (hoang h)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yan yang ((hua gene) OR (human gene)) yang liang ((hoang ghi) or (hoang h)) ;*.