Perhaps you should try some spelling variations:
lang cong » dang cong, bang cong, hang cong
tac thong » tac thuong, tac trong, tac chong
thong dan » thong van, tuong dan, thong den
doc hieu » hoc thieu, hoc hien
cong tac » cong ty
dan van » dang van, doan van, dao van
van ca » van cau, van cua, dan ca

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) or (toc thieu)) tinh - lang cong tac thong thong dan van ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) tinh - lang cong tac thong thong dan van ca.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) tinh - lang cong tac thong thong dan van ca*.