Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
cong tan » cong tac, cong san, cong thanh
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)) tach - hanh trinh va dung cong tan ((toan ban) OR (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) tach - hanh trinh va dung cong tan ((toan ban) OR (van ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (hoc thieu)) tach - hanh trinh va dung cong tan ((toan ban) OR (van ban))".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) tach - hanh trinh va dung cong tan ((toan ban) OR (van ban))*.