Perhaps you should try some spelling variations:
yan jianping » zhao jianping, yu jianxing
yan yanling » wang yanling
hua gene » human gene, hua ren, hy5 gene
sang tin » sang minh, lang tim, sang tae
tin hong » tan hong, kia hong, thi hong
hong hai » shang hai, zhong tai, dang hai
a gene » a genre, a gender, a gentle

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: lang ((yan yanling) OR (yan jianping)) ((hua gene) OR (a gene)) sang tin hong hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang ((yan yanling) or (yan jianping)) ((hua gene) OR (a gene)) sang tin hong hai ;~".
• Adding a wildcard symbol may retrieve word variants: lang ((yan yanling) or (yan jianping)) ((hua gene) OR (a gene)) sang tin hong hai ;*.