Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
tung cua » trung cua, tuong cua, dung cua
cua nang » chua nang, cua dang, cua hang
song dan » song danh, song van, cong 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.

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chinh sach) or (hieu lang)) - thanh tung cua nang song dan phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chinh sach) OR (hieu lang)) - thanh tung cua nang song dan phan cac.
• Adding a wildcard symbol may retrieve word variants: theo ((chinh sach) or (hieu lang)) - thanh tung cua nang song dan phan cac*.