Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu qua, diep quang
hieu quan » hieu qua, lieu quan, thien quan
trung cua » truong cua, trung tuan, trung cap
cong cong » trong cong, dung cong, dang cong
manh toan » thanh toan, anh tuan, tinh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho ((hieu quang) OR (hieu quan)) - thanh trung cua ((cong cong) or (cong dong)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((hieu quang) OR (hieu quan)) - thanh trung cua ((cong cong) OR (cong dong)) manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((hieu quang) OR (hieu quan)) - thanh trung cua ((cong cong) or (cong dong)) manh toan cao".
• Adding a wildcard symbol may retrieve word variants: nho ((hieu quang) OR (hieu quan)) - thanh trung cua ((cong cong) or (cong dong)) manh toan cao*.