Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh tuan » trinh quan, trinh toan, trinh luan
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, ho chieu, mot chieu
nhung don » nhung van, nhung bo
tran van » luan van
doi chi » doi khi

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 (doi chi)) sach - hanh trinh tuan ((nhung don) or (thong cong)) tan tran van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sach - hanh trinh tuan ((nhung don) OR (thong cong)) tan tran van.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doi chi)) sach - hanh trinh tuan ((nhung don) or (thong cong)) tan tran van".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doi chi)) sach - hanh trinh tuan ((nhung don) or (thong cong)) tan tran van*.