Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
hieu lang » chieu sang, hieu quang, nhieu tang
cua tong » cua cong, cua dong, cua song
cua nong » cua cong, cuu nong, cua dong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cac » nhan cach, phan dau, phan lap

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: theo ((chinh sach) OR (hieu lang)) - thanh tuong ((cua tong) OR (cua nong)) cong dan phan cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chinh sach) or (hieu lang)) - thanh tuong ((cua tong) OR (cua nong)) cong dan phan cac~".
• Adding a wildcard symbol may retrieve word variants: theo ((chinh sach) or (hieu lang)) - thanh tuong ((cua tong) OR (cua nong)) cong dan phan cac*.