Perhaps you should try some spelling variations:
young child » young children
david young » david loundy
mark david » mare davide, parker david
yang yang » wang yang, wang yan
zili gene » iii gene
gene mark » gene bank, gene part, nene marc
yan yang » yao yang, dan yang, tan 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) ((yan yang) OR (yang yang)) zili gene mark david young child ;~.
• Adding a wildcard symbol may retrieve word variants: (wang or lang) ((yan yang) or (yang yang)) zili gene mark david young child ;*.