Perhaps you should try some spelling variations:
dong hoang » hong hong
gene yang » gene bank
yang sein » yang dean, yang jin, yang lin
dann hai » dang hai, dann hat, dann war
dann kam » dann hat, dann war
de a » de la, de sa, der a
me a » m a, me _, e a
y a » y la

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 hoang ((((de a) OR (y a))) OR (me a)) gene yang sein ((dann hai) OR (dann kam)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong hoang ((((de a) or (y a))) or (me a)) gene yang sein ((dann hai) OR (dann kam)) ;~".
• Adding a wildcard symbol may retrieve word variants: dong hoang ((((de a) or (y a))) or (me a)) gene yang sein ((dann hai) OR (dann kam)) ;*.