Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thanh tung » thanh cong
thong cong » tong cong, thong thong, phong chong
hoc thieu » toc thieu, hoc hien
tung tuan » trung tuan, hung tuan, quang tuan
tac nhan » tao nhan, dac nhan, tan nhan
cac nhan » ca nhan, cac nha, cam nhan

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 tuan ((thong cong) OR (trong cong)) ((tac nhan) OR (cac nhan)) cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - thanh tung tuan ((thong cong) OR (trong cong)) ((tac nhan) or (cac nhan)) cap~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh tung tuan ((thong cong) OR (trong cong)) ((tac nhan) or (cac nhan)) cap*.