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