Perhaps you should try some spelling variations:
thong duong » tuong duong, thong dung, thong huong
thanh tung » thanh cong
khong dung » thong dung, phuong dung, cuong dung
hieu lang » chieu sang, hieu quang, nhieu tang
tung cua » trung cua, tuong cua, dung cua
than cap » khan cap, thanh lap, thanh cac
toan ban » van ban
he hieu » he nhieu, he dieu, de hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: he hieu lang - thanh tung cua ((khong dung) or (thong duong)) dan ((than cap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: he hieu lang - thanh tung cua ((khong dung) OR (thong duong)) dan ((than cap) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: he hieu lang - thanh tung cua ((khong dung) or (thong duong)) dan ((than cap) or (toan ban))*.