Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
dan thanh » dang thanh, danh thanh, ban thanh
thanh cac » hanh cac, thanh bac, thanh ca
doi hieu » doi chieu, doc hieu, doi hien
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
cong dan » cong san, cong tan, huong dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - manh ((trung va) OR (trung ha)) nhung cong dan thanh cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - manh ((trung va) OR (trung ha)) nhung cong dan thanh cac".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - manh ((trung va) OR (trung ha)) nhung cong dan thanh cac*.