Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thieu » hoc hien
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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: ((hoc thieu) OR (toc thieu)) xanh - thanh ((trung cua) OR (trung cap)) nhung cong tac toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (toc thieu)) xanh - thanh ((trung cua) OR (trung cap)) nhung cong tac toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (toc thieu)) xanh - thanh ((trung cua) OR (trung cap)) nhung cong tac toan cao*.