Perhaps you should try some spelling variations:
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
le nhung » len nhung, ve nhung, le hung
dan toan » van toan, dan than, manh toan
ho hieu » ho chieu, hoi hieu, nho hieu
tung le » tuong le, tang le, dung le

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 hieu lang - thanh tung le nhung cong ((dan toan) OR (anh tuan)) cau~.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh tung le nhung cong ((dan toan) or (anh tuan)) cau*.