Perhaps you should try some spelling variations:
jeong dahyeon » jeong hyeok
dong hoang » hong hong
jeong yeon » jeong hyeok, jeang yean, seung yeon
wang yang » wang yan, wang liang, wang yanling
gene yang » gene bank
hua gene » human gene, a gene, hua ren
yang jin » yang jie, yang jun, ying jin

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: ((wang yang) OR (dong hoang)) ya hua gene yang jin ((jeong yeon) OR (jeong dahyeon)) ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (dong hoang)) ya hua gene yang jin ((jeong yeon) or (jeong dahyeon)) ;*.