Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu
trong van » trong cac
tranh va » tranh van, trang va, trinh va
van than » van thanh, van thang, van tuan
than cao » toan cao, thai cao, than cap
va dung » van dung, va duong, vat dung

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 (((hoc thieu) or (hoc hien)))) tinh - canh tranh va dung trong van than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (((hoc thieu) OR (hoc hien)))) tinh - canh tranh va dung trong van than cao.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (((hoc thieu) or (hoc hien)))) tinh - canh tranh va dung trong van than cao*.