Perhaps you should try some spelling variations:
human gender » bhutan gender, human gene, german gender
sang minh » kang minah, anh minh, song ming
yang jin » yang jie, yang jun, ying jin
song min » song ming, gong min, jong min
hong hai » shang hai, zhong tai, dang hai
yang ya » yang yao, yang ka, yang y
yang yi » yang di, yang xi, yang jui
ngo a » ngos a, neo a, ngo 1

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((yang ya) or (yang yi))ngo a human gender ((yang jin) or (((sang minh) OR (song min)))) hong hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((yang ya) OR (yang yi))ngo a human gender ((yang jin) OR (((sang minh) OR (song min)))) hong hai ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yang ya) or (yang yi))ngo a human gender ((yang jin) or (((sang minh) OR (song min)))) hong hai ;".
• Adding a wildcard symbol may retrieve word variants: ((yang ya) or (yang yi))ngo a human gender ((yang jin) or (((sang minh) OR (song min)))) hong hai ;*.