Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
chua xang » chua nang, chuc nang, chu bang
hang cong » dang cong, hang nong, bang cong
cho chua » cho chu, cho cua, ho chua
tran van » luan van
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap
tang va » trang va, tang van, thang va

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: cho chua xang - hanh ((tang va) OR (tran van)) ((nhung cong) OR (hang cong)) dan than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cho chua xang - hanh ((tang va) or (tran van)) ((nhung cong) OR (hang cong)) dan than cao~".
• Adding a wildcard symbol may retrieve word variants: cho chua xang - hanh ((tang va) or (tran van)) ((nhung cong) OR (hang cong)) dan than cao*.