Perhaps you should try some spelling variations:
hoi tieu » hoc tieu, hoi hieu, hoi tiep
mai dung » mai huong, manh dung, ap dung
mai hung » manh hung, van hung
cong tan » cong tac, cong san, cong thanh
tan gian » tran gian, dan gian, van gian
gian cam » gian cham, gian cac, gia cam
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho hieu) or (hoi tieu)) lang - canh tranh ((mai dung) OR (mai hung)) cong tan gian cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (hoi tieu)) lang - canh tranh ((mai dung) OR (mai hung)) cong tan gian cam.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) or (hoi tieu)) lang - canh tranh ((mai dung) OR (mai hung)) cong tan gian cam".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (hoi tieu)) lang - canh tranh ((mai dung) OR (mai hung)) cong tan gian cam*.