Perhaps you should try some spelling variations:
hieu nganh » hiem ngan, hieu manh, nghiep nganh
vien nganh » vien thanh
trung tuan » trung thanh, trung tam, tran tuan
trung cua » truong cua, trung cap, dung cua
tong cong » trong cong, cong cong, dung cong
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap

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 ((hieu nganh) OR (vien nganh)) - thanh ((trung cua) OR (trung tuan)) tong cong san than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu nganh) OR (vien nganh)) - thanh ((trung cua) or (trung tuan)) tong cong san than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu nganh) OR (vien nganh)) - thanh ((trung cua) or (trung tuan)) tong cong san than cau*.