Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cap dung » ap dung, cao dung, chan dung
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

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 trung) OR (thanh tung)) cap dung cong dan than cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - ((thanh trung) OR (thanh tung)) cap dung cong dan than cap".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - ((thanh trung) OR (thanh tung)) cap dung cong dan than cap*.