Perhaps you should try some spelling variations:
trung thanh » truong thanh
chieu sang » chieu sach, chieu xanh, nhieu tang
cong trung » chong trung, cong truong, cong trong
hieu lang » hieu quang, nhieu tang, hieu van
trong qua » trong quan, trong nha, duong qua
thong qua » thong quan, thong cua, thong tu
dung cong » dung trong
thanh cap » thanh lap, hanh cap, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (hieu lang)) - thanh ((trong qua) OR (thong qua)) dung cong trung thanh cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - thanh ((trong qua) OR (thong qua)) dung cong trung thanh cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu lang)) - thanh ((trong qua) OR (thong qua)) dung cong trung thanh cap".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - thanh ((trong qua) OR (thong qua)) dung cong trung thanh cap*.