Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
tang luan » dung luan
luan phan » luan van, luan hoan
phan cong » thanh cong
anh tang » anh bang, anh dang, anh nang
cong tan » cong tac, cong san, cong thanh
tcan cau » toan cau, toan cao, van cau
can cau » van cau, ban cau, ca cau

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 (hoc thieu)) sach - anh tang luan phan cong tan ((tcan cau) or (can cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) sach - anh tang luan phan cong tan ((tcan cau) OR (can cau)).
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) sach - anh tang luan phan cong tan ((tcan cau) or (can cau))*.