Perhaps you should try some spelling variations:
duong cong » dung cong, luong cong, duong trong
cua duong » cua dong, cua huong, qua duong
theo chu » theo chieu, cho chu, chao chu
mang cua » manh cua, dung cua, ban cua
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.

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