Perhaps you should try some spelling variations:
mark david » mare davide, parker david
bank david » black david, bank ravi, park david
liang tan » liang dan, liang sun, wing tan
tan yang » dan yang, tan ying, tan yong
11 gene » a1 gene, l1 gene, 11 gender
1 gene » a1 gene, l1 gene, _ gene
choi » chi, cho

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: liang tan yang ((1 gene) OR (11 gene)) ((bank david) OR (mark david)) young choi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "liang tan yang ((1 gene) OR (11 gene)) ((bank david) or (mark david)) young choi ;~".
• Adding a wildcard symbol may retrieve word variants: liang tan yang ((1 gene) OR (11 gene)) ((bank david) or (mark david)) young choi ;*.