Perhaps you should try some spelling variations:
thanh trung » thanh tung
tuong cong » truong cong, trong cong, tong cong
hieu lang » chieu sang, hieu quang, nhieu tang
trung va » truong va, trang va, trung ha
va tuong » va thuong, va thong, xa truong
cong san » cong tac
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh trung va tuong cong san ((((toan ban) or (toan tap))) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh trung va tuong cong san ((((toan ban) OR (toan tap))) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh trung va tuong cong san ((((toan ban) or (toan tap))) or (toan cao))*.