Perhaps you should try some spelling variations:
thanh thuong » thanh huong, thanh chuong, thanh phuong
nhung cong » thong cong, hang cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
thuong tu » thong tu, tuong tu, huong tu
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
toan cau » toan cao, toan tap, toan tai
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: doc hieu lang - thanh thuong tu ((nhung cong) or (dung cong)) tan ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh thuong tu ((nhung cong) OR (dung cong)) tan ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - thanh thuong tu ((nhung cong) or (dung cong)) tan ((toan cau) or (toan ban))*.