Perhaps you should try some spelling variations:
man changed » main changes, has changed, can change
a changed » _ changed, a change, has changed
yang jie » yang jin, yang di, yang jui
jie song » jae song, jin song, kim song
song hai » hong hai, shang hai, dang hai
e gene » _ gene
a gene » a genre, a gender, a gentle

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: lang ((man changed) OR (a changed)) ((e gene) OR (a gene)) yang jie song hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang ((man changed) OR (a changed)) ((e gene) or (a gene)) yang jie song hai ;~".
• Adding a wildcard symbol may retrieve word variants: lang ((man changed) OR (a changed)) ((e gene) or (a gene)) yang jie song hai ;*.