Perhaps you should try some spelling variations:
khong cong » thong cong, khong cang, chong cong
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
tung tam » trung tam, vung tam, tuong tac
dung tam » duong tam, dung tai, dung lam
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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 ((hien xanh) OR (hien hanh)) - thanh ((tung tam) OR (dung tam)) khong cong tac toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien hanh)) - thanh ((tung tam) OR (dung tam)) khong cong tac toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien hanh)) - thanh ((tung tam) OR (dung tam)) khong cong tac toan ban*.