Perhaps you should try some spelling variations:
yan jianping » zhao jianping, yu jianxing
yan yanling » wang yanling
human gene » human genome, human gender, human bone
sang yimin » wang limin
yimin dang » limin wang
hua gene » a gene, hua ren, hy5 gene
hai » hadi, haji, hari

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