Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
thanh cau » thanh chau, thanh mau, nhanh cau
trang va » hang va
tran van » luan van
cong van » cong vang, song van, cong tan
cong san » cong tac

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 ((trang va) OR (tran van)) nhung ((cong van) or (cong san)) thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((trang va) OR (tran van)) nhung ((cong van) OR (cong san)) thanh cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh ((trang va) OR (tran van)) nhung ((cong van) or (cong san)) thanh cau*".