Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, ho chieu
duoc lieu » du lieu
lang cong » dang cong, bang cong, hang cong
tranh va » tranh van, trang va, trinh va
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
va lang » va nang, hoa lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (duoc lieu)) tinh - canh tranh va lang cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (duoc lieu)) tinh - canh tranh va lang cong tan toan cao.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (duoc lieu)) tinh - canh tranh va lang cong tan toan cao*.