Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
hanh tran » hanh trang, thanh tran, hanh tram
dang cong » dung cong
bang cong » bang song, hang cong, dung cong
thanh cac » hanh cac, thanh bac, thanh ca
tran van » luan van
than cap » khan cap, thanh lap, than cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sach - hanh tran van ((dang cong) or (bang cong)) dan ((than cap) or (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh tran van ((dang cong) OR (bang cong)) dan ((than cap) OR (thanh cac)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh tran van ((dang cong) or (bang cong)) dan ((than cap) or (thanh cac))*.