Perhaps you should try some spelling variations:
young john » kong john, wong john, young jean
human gene » human genome, human gender, human bone
yuan ting » yuan ming, huang ting, yuan kang
ying john » king john, ying jin, kong john
wong shiu » wong siu, cong shu, song shin
ting tan » tin tan, wing tan, liang tan
hua gene » a gene, hua ren, hy5 gene

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 tan ((hua gene) OR (human gene)) ((ying john) OR (young john)) wong shiu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yuan ting tan ((hua gene) or (human gene)) ((ying john) OR (young john)) wong shiu ;~".
• Adding a wildcard symbol may retrieve word variants: yuan ting tan ((hua gene) or (human gene)) ((ying john) OR (young john)) wong shiu ;*.