Perhaps you should try some spelling variations:
wang danning » wang yanling, wang daoping, wang yangming
human gender » bhutan gender, german gender, human genome
human gene » human genome, human bone, human genetic
danning a » planning a, scanning a, running a
sang minh » kang minah, anh minh, song ming
song min » song ming, gong min, jong min

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 danning a ((human gene) OR (human gender)) ((sang minh) OR (song min)) dang (hai OR haji) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang danning a ((human gene) or (human gender)) ((sang minh) OR (song min)) dang (hai or haji) ;~".
• Adding a wildcard symbol may retrieve word variants: wang danning a ((human gene) or (human gender)) ((sang minh) OR (song min)) dang (hai or haji) ;*.