Perhaps you should try some spelling variations:
yala human » data human, malawi human
human gene » human genome, human gender, human bone
dong nana » dong nan, dong yang
nana yala » nana yaa
yang jin » yang jie, yang jun, shang jin
ying jin » jing ji, yang jie
yang yi » yang di, yang xi, yang jui

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: dong nana yala human gene ((yang jin) OR (((ying jin) OR (yang yi)))) hong seo ;~.
• Adding a wildcard symbol may retrieve word variants: dong nana yala human gene ((yang jin) or (((ying jin) or (yang yi)))) hong seo ;*.