Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
duong cong » dung cong, luong cong, duong trong
hieu lang » chieu sang, hieu quang, nhieu tang
trung cap » truong cao, trung tam
cap duong » cau duong, cac duong, cap dung
cong tac » cong ty
tren cau » tren ca, tren cay, trinh cau
tren tau » tren thuc, tren may, tren dat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (hieu lang)) - thanh trung cap duong cong tac ((tren cau) or (tren tau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu lang)) - thanh trung cap duong cong tac ((tren cau) OR (tren tau)).
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu lang)) - thanh trung cap duong cong tac ((tren cau) or (tren tau))*.