Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
amin hong » min hong, among hong, tin hong
hong guan » thong guan, cheng guan, hong tan
yang fan » zhang fan, yang dean, yang jin
20 human » 2 human, 10 human, 2011 human
data iii » data iv
data im » data iv
g 20 » _ 20

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: ((((yang yang) OR (yang fan))) OR (yang di))g 20 human ((data iii) OR (data im)) amin hong guan ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((yang yang) or (yang fan))) or (yang di))g 20 human ((data iii) OR (data im)) amin hong guan ;~".
• Adding a wildcard symbol may retrieve word variants: ((((yang yang) or (yang fan))) or (yang di))g 20 human ((data iii) OR (data im)) amin hong guan ;*.