Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc chinh » hoan chinh, hoc sinh, hoc kinh
tung tam » trung tam, vung tam, tuong tac
dung tam » duong tam, dung tai, dung lam
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap
khan cap » khan ap, than cap, khoan cam

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 chinh sach - thanh ((tung tam) OR (dung tam)) nhung cong tan ((than cau) OR (khan cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chinh sach - thanh ((tung tam) OR (dung tam)) nhung cong tan ((than cau) or (khan cap))~".
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - thanh ((tung tam) OR (dung tam)) nhung cong tan ((than cau) or (khan cap))*.