Perhaps you should try some spelling variations:
among german » among nigerian, among formal
human gender » bhutan gender, german gender, human genome
human gene » human genome, human bone, human genetic
wong siu » wong shiu, kong siu, wong sau
bias 1 » bias _, bias 3
1 wong » y wong
dong » doing, long, done

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong sin) or (among german)) 2 ((human gender) OR (human gene)) bias 1 wong siu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong sin) OR (among german)) 2 ((human gender) OR (human gene)) bias 1 wong siu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong sin) or (among german)) 2 ((human gender) OR (human gene)) bias 1 wong siu ;*".