Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
cong ngang » cong nhan, cong quang, cong lang
hoc thieu » toc thieu, hoc hien
hanh hang » thanh hang, hang hang, hanh han
thanh cac » hanh cac, thanh bac, thanh ca
cong van » cong vang, cong san, song van
than cap » khan cap, thanh lap, than cua
va dang » van dang, va nang, va lang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh hang va dang ((cong van) OR (cong ngang)) ((than cap) OR (thanh cac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh hang va dang ((cong van) or (cong ngang)) ((than cap) OR (thanh cac))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh hang va dang ((cong van) or (cong ngang)) ((than cap) OR (thanh cac))*.