Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
doi chieu » doi chi, ho chieu, mot chieu
doc hieu » toc thieu, hoc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
cong van » cong vang, song van, cong tan
cong san » cong tac
toan ban » van ban

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 (doc hieu)) tach - hanh trinh va nhung ((cong van) OR (cong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) tach - hanh trinh va nhung ((cong van) OR (cong san)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doc hieu)) tach - hanh trinh va nhung ((cong van) OR (cong san)) toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) tach - hanh trinh va nhung ((cong van) OR (cong san)) toan ban*.