Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung cap, dung cua
hoi hieu » hoi phieu, hoi tieu, moi hieu
cong tac » cong ty
tac chan » tac chuan, tac can, tac chon
chan cau » phan cau, can cau, chinh cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - thanh ((trung cua) OR (trung tuan)) nhung cong tac chan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - thanh ((trung cua) OR (trung tuan)) nhung cong tac chan cau".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - thanh ((trung cua) OR (trung tuan)) nhung cong tac chan cau*.