Perhaps you should try some spelling variations:
yuan ting » yuan ming, huang ting, yuan kang
ting tao » ting dato, wang tao
hua gene » human gene, hy5 gene
yang tan » yang fan, yang yang, liang tan
hong shu » cong shu, tong shui, wong shiu
hua ren » hua chen
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: yuan ting tao ((((hua gene) OR (a gene))) OR (hua ren)) ((yang tan) OR (yang dean)) hong shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yuan ting tao ((((hua gene) OR (a gene))) or (hua ren)) ((yang tan) or (yang dean)) hong shu ;~".
• Adding a wildcard symbol may retrieve word variants: yuan ting tao ((((hua gene) OR (a gene))) or (hua ren)) ((yang tan) or (yang dean)) hong shu ;*.