Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
hieu quang » thieu quang, hieu quan, hieu qua
thanh tung » thanh cong
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, cong dong
toan tap » toan ban
tung va » trung va, tuong va, dung va

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 ((nhieu tang) OR (hieu quang)) - thanh tung va thong ((cong dan) OR (huong dan)) toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((nhieu tang) or (hieu quang)) - thanh tung va thong ((cong dan) OR (huong dan)) toan tap~".
• Adding a wildcard symbol may retrieve word variants: ho ((nhieu tang) or (hieu quang)) - thanh tung va thong ((cong dan) OR (huong dan)) toan tap*.