Perhaps you should try some spelling variations:
trinh tuan » trinh quan, trinh toan, trinh luan
hanh trinh » canh tranh, hanh chinh
tuan nhung » quan nhung, tuan hung, thuat nhung
nhung cong » dung cong, thong cong, hang cong
doc hieu » toc thieu, hoc thieu
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: ((doc hieu) OR (hoc hien)) sach - hanh trinh tuan nhung cong tan tran van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (hoc hien)) sach - hanh trinh tuan nhung cong tan tran van".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (hoc hien)) sach - hanh trinh tuan nhung cong tan tran van*.