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