Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
nang cong » nang song, dang cong, hang cong
bang cong » dang cong, bang song, hang cong
manh toan » thanh toan, anh tuan, tinh toan
tuong va » truong va, thuong va, luong va
toan cao » toan ban, toan tap
tung va » trung va, dung va, vung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - thanh ((tung va) or (tuong va)) ((nang cong) or (bang cong)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - thanh ((tung va) OR (tuong va)) ((nang cong) OR (bang cong)) manh toan cao.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - thanh ((tung va) or (tuong va)) ((nang cong) or (bang cong)) manh toan cao*.