Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
hieu quan » hieu qua, lieu quan, thien quan
tuong va » truong va, thuong va, luong va
va thong » va thuong, va phuong, he thong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van ban

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) or (hieu quan)) - thanh tuong va thong cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quan)) - thanh tuong va thong cong tan toan ban.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu quan)) - thanh tuong va thong cong tan toan ban*.