Perhaps you should try some spelling variations:
dong nana » dong nan, dong yang
yang yang » wang yan
wang yang » wang yan, wang liang, wang yanling
hua gene » human gene, hua ren, hy5 gene
yang tan » yang fan, yang dean, liang tan
tan dang » tan yang, tang tang, tan hong
a gene » a genre, a gender, a gentle
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 nana) or (((yang yang) or (wang yang)))) yala ((hua gene) OR (a gene)) yang tan dang hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong nana) OR (((yang yang) OR (wang yang)))) yala ((hua gene) OR (a gene)) yang tan dang hai ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong nana) or (((yang yang) or (wang yang)))) yala ((hua gene) OR (a gene)) yang tan dang hai ;".
• Adding a wildcard symbol may retrieve word variants: ((dong nana) or (((yang yang) or (wang yang)))) yala ((hua gene) OR (a gene)) yang tan dang hai ;*.