Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thanh tung » thanh cong
bang tuong » ban tuong, lang tuong, hang thuong
bang suong » bang song, bang phuong, nang song
hoc thieu » toc thieu, hoc hien
tung lap » trung lap, dung lap, tuong lai
can cau » van cau, ca cau, cac cau
ban cau » bang cau, ban can, van cau

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 - thanh tung lap ((bang tuong) OR (bang suong)) dan ((can cau) OR (ban cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - thanh tung lap ((bang tuong) or (bang suong)) dan ((can cau) OR (ban cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh tung lap ((bang tuong) or (bang suong)) dan ((can cau) OR (ban cau))*.