Perhaps you should try some spelling variations:
human gender » bhutan gender, human gene, german gender
yang yang » wang yang, wang yan
sheng jin » shang jin, sheng jou, sheng qi
yong yan » dong yang, ying yang, yong yoon
hua gene » human gene, a gene, hua ren
jin song » jie song, john song, kim song
song shu » cong shu, song shin, tong shui

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((yong yan) or (yang yang)) ((hua gene) or (human gender)) sheng jin song shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yong yan) OR (yang yang)) ((hua gene) OR (human gender)) sheng jin song shu ;.
• Adding a wildcard symbol may retrieve word variants: wang ((yong yan) or (yang yang)) ((hua gene) or (human gender)) sheng jin song shu ;*.