Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh huong, thanh cuong
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
cua dung » cua dang, cua dong, qua dung
trong ty » trong ky, trong ly, trong tu
toan tap » toan ban
toan cao » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - ((thanh tuong) OR (thanh tung)) cua dung trong ty ((toan tap) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - ((thanh tuong) OR (thanh tung)) cua dung trong ty ((toan tap) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - ((thanh tuong) OR (thanh tung)) cua dung trong ty ((toan tap) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - ((thanh tuong) OR (thanh tung)) cua dung trong ty ((toan tap) or (toan cao))*.