Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh tuan » trinh quan, trinh toan, trinh luan
tuan nhung » quan nhung, tuan hung, thuat nhung
doc hieu » hoc thieu, hoc hien
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
tran van » luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (toc thieu)) sach - hanh trinh tuan nhung ((cong tan) OR (cong tac)) tran van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) sach - hanh trinh tuan nhung ((cong tan) OR (cong tac)) tran van.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (toc thieu)) sach - hanh trinh tuan nhung ((cong tan) OR (cong tac)) tran van".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) sach - hanh trinh tuan nhung ((cong tan) OR (cong tac)) tran van*.