Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, bang cong
hoc hieu » hoc hien, doc hieu, hoc dieu
tranh va » tranh van, trang va, trinh va
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hieu) or (hoc thieu)) manh - canh tranh va hang cong ((dan toan) OR (dan than)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (hoc thieu)) manh - canh tranh va hang cong ((dan toan) OR (dan than)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) or (hoc thieu)) manh - canh tranh va hang cong ((dan toan) OR (dan than)) tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (hoc thieu)) manh - canh tranh va hang cong ((dan toan) OR (dan than)) tap*.