Perhaps you should try some spelling variations:
tieu sang » chieu sang, tieu dung, tiem nang
dung cong » dung trong
mang van » tang van, lang van, mang va
dang van » hoang van, hang va
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sang - hanh ((mang van) or (dang van)) dung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sang - hanh ((mang van) OR (dang van)) dung cong dan toan cao*.