Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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) or (((hoc hien) or (toc thieu)))) sach - thanh trung cua dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tieu) OR (((hoc hien) OR (toc thieu)))) sach - thanh trung cua dung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (((hoc hien) or (toc thieu)))) sach - thanh trung cua dung cong tac toan cau*.