Perhaps you should try some spelling variations:
thanh trung » thanh tung
truong cong » trong cong, truong long, truong chung
truong dong » trong dong, truong dang, tuong dong
trung tuan » trung thanh, trung tam, tran tuan
hieu quan » hieu qua, lieu quan, thien quan
chu quang » chat quang, vu quang
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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