Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trung va » truong va, trang va, trung ha
cong san » cong tac
than cao » thai cao, than cap, than sao
toan cao » toan ban, toan tap

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: ho ((hieu lang) OR (lieu va)) - thanh trung va nhung cong san ((than cao) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (lieu va)) - thanh trung va nhung cong san ((than cao) OR (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (lieu va)) - thanh trung va nhung cong san ((than cao) OR (toan cao))*.