Perhaps you should try some spelling variations:
truong hai » truong dai, truong tai, truong ham
trong hai » trong thai, trong tai, trong hoat
bang cong » dang cong, bang song, hang cong
khi tach » thi tac, khi sac, khi ta
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi khi tach - thanh ((truong hai) or (trong hai)) bang cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi khi tach - thanh ((truong hai) OR (trong hai)) bang cong tan toan cau.
• Adding a wildcard symbol may retrieve word variants: doi khi tach - thanh ((truong hai) or (trong hai)) bang cong tan toan cau*.