Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hoc thieu » toc thieu
thanh tra » thanh toan, thanh hoa
hang cong » dang cong, hang nong, bang cong
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap
tra van » tran van, ta van, trang van

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: ((hoc thieu) OR (hoc hien)) xanh - thanh tra van ((nhung cong) OR (hang cong)) dan than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (hoc hien)) xanh - thanh tra van ((nhung cong) OR (hang cong)) dan than cao~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (hoc hien)) xanh - thanh tra van ((nhung cong) OR (hang cong)) dan than cao*.