Perhaps you should try some spelling variations:
using dna » using dea, using data, using drag
wong shiu » wong siu, cong shu, song shin
hua gene » human gene, a gene, hua ren
gene yan » gene bank, ren yan, see yan
hong shu » cong shu, tong shui, hong seo
wong yue » wang yue, hong yu
using a » using _
yan tan » tan tan, yan clan, yan guan

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: done ((using dna) OR (using a)) hua gene yan tan ((((hong shu) OR (wong shiu))) OR (wong yue)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "done ((using dna) or (using a)) hua gene yan tan ((((hong shu) OR (wong shiu))) or (wong yue)) ;~".
• Adding a wildcard symbol may retrieve word variants: done ((using dna) or (using a)) hua gene yan tan ((((hong shu) OR (wong shiu))) or (wong yue)) ;*.