Perhaps you should try some spelling variations:
david young » david loundy
young child » young children
mark david » mare davide, parker david
zili gene » iii gene
gene mark » gene bank, gene part, nene marc
tan yang » dan yang, tan ying, tan yong
yao yang » yang yang
wang » wing, wan

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 OR lang) ((tan yang) OR (yao yang)) zili gene mark david young child ;~.
• Adding a wildcard symbol may retrieve word variants: (wang or lang) ((tan yang) or (yao yang)) zili gene mark david young child ;*.