Perhaps you should try some spelling variations:
yuan chang » yuan cheng, huang chang, han chang
human gene » human genome, human gender, human bone
yuan wang » yan wang, yuan kang, qian wang
yang lin » yang jin, wang lin, yang li
zong seo » hong seo, kong sek, von seo
song so » song von
a gene » a genre, a gender, a gentle

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((yuan wang) or (yuan chang)) wang ((a gene) or (human gene)) yang lin ((zong seo) OR (song so)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((yuan wang) OR (yuan chang)) wang ((a gene) OR (human gene)) yang lin ((zong seo) OR (song so)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yuan wang) or (yuan chang)) wang ((a gene) or (human gene)) yang lin ((zong seo) OR (song so)) ;*".