Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
tran hoang » tran hong, quan hoang, tran quang
doi chieu » doc hieu, doi chi, mot chieu
tuan hang » tuan hoang, tuan bang, tuan dang
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 (tran 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 (tran hoang)) cong tan tran van.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (ho chieu)) sach - hanh trinh ((tuan hang) or (tran hoang)) cong tan tran van*.