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