Perhaps you should try some spelling variations:
mark david » mare davide, parker david
bank david » black david, bank ravi, park david
young ghi » hong ghi, young get, young hr
lang tan » liang tan, lang lang, tang tang
tan yang » dan yang, tan ying, tan yong
yang l1 » yang li, yang all, yang lin
l1 gene » 1 gene, 11 gene, a1 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: lang tan yang l1 gene ((bank david) OR (mark david)) ((young ghi) OR (young choi)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang tan yang l1 gene ((bank david) or (mark david)) ((young ghi) OR (young choi)) ;~".
• Adding a wildcard symbol may retrieve word variants: lang tan yang l1 gene ((bank david) or (mark david)) ((young ghi) OR (young choi)) ;*.