Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
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 luan ((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 luan ((nhung don) OR (thong cong)) tan tran van.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) sach - hanh trinh luan ((nhung don) or (thong cong)) tan tran van*.