Perhaps you should try some spelling variations:
using tax » using a
using dna » using dea, using data, using drag
using ya » using a, using _, using 4d
hua gene » human gene, a gene, hua ren
gene yan » gene bank, ren yan, see yan
hong ghi » zhong zhi, hong g, hong hai
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: doom ((((using ya) OR (using tax))) OR (using dna)) hua gene yan tan hong ghi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doom ((((using ya) OR (using tax))) or (using dna)) hua gene yan tan hong ghi ;~".
• Adding a wildcard symbol may retrieve word variants: doom ((((using ya) OR (using tax))) or (using dna)) hua gene yan tan hong ghi ;*.