Perhaps you should try some spelling variations:
jeong yeon » jeong hyeok, jeang yean, seung yeon
yan liang » yang liang, wang liang, you liang
yang yang » wang yang, wang yan
gene yang » gene bank
jeong seo » hong seo, jeong su
hai gene » a gene, a1 gene, hai 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: dong ((yan liang) OR (yang yang)) hai gene yang jin ((jeong seo) OR (jeong yeon)) ;~.
• Adding a wildcard symbol may retrieve word variants: dong ((yan liang) or (yang yang)) hai gene yang jin ((jeong seo) or (jeong yeon)) ;*.