Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
canh tran » canh tranh, hanh trang, banh trang
van thong » van thuong, va thong, van thang
van phong » van dong, hai phong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
toan ban » van ban

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 - canh tran ((van thong) OR (van phong)) cong manh toan ban~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - canh tran ((van thong) or (van phong)) cong manh toan ban*.