Perhaps you should try some spelling variations:
yang yang » wang yan
wang yang » wang yan, wang liang, wang yanling
gene yang » gene bank
dong nan » dong yang, dong sin, dong bin
yala hua » ya hua
hua gene » human gene, a gene, hua ren
yang tan » yang fan, yang dean, liang tan
tan dang » tan yang, tang tang, tan hong
hai » hadi, haji, hari

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong nan) or (((yang yang) or (wang yang)))) yala hua gene yang tan dang hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong nan) OR (((yang yang) OR (wang yang)))) yala hua gene yang tan dang hai ;.
• Adding a wildcard symbol may retrieve word variants: ((dong nan) or (((yang yang) or (wang yang)))) yala hua gene yang tan dang hai ;*.