Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh tuan » trinh quan, trinh toan, trinh luan
hieu sach » chieu sach, hieu cach, dien sach
tuan hung » tran hung, luan hung, tuan dung
hung cong » nhung cong, hung cuong, phung cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
luan » quan, lan

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 sach - hanh trinh tuan hung cong tan ((tran van) or (luan van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - hanh trinh tuan hung cong tan ((tran van) OR (luan van)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - hanh trinh tuan hung cong tan ((tran van) or (luan van))*.