Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
trung cong » truong cong, trong cong, trung uong
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung cap, dung cua
cong san » cong tac
toan cao » toan tap
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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: ho hieu lang - thanh ((trung cua) OR (trung tuan)) trung cong san ((toan cao) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - thanh ((trung cua) OR (trung tuan)) trung cong san ((toan cao) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh ((trung cua) OR (trung tuan)) trung cong san ((toan cao) or (toan ban))*.