Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
dung cong » dung trong
anh tang » anh bang, anh dang, anh nang
van thai » van thoai, van tai, van hai
thai cao » tai cao, thoai cac, thuat cao
tang va » trang va, tang van, thang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (hieu lang)) - anh tang va ((nhung cong) OR (dung cong)) van thai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - anh tang va ((nhung cong) OR (dung cong)) van thai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu lang)) - anh tang va ((nhung cong) OR (dung cong)) van thai cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - anh tang va ((nhung cong) OR (dung cong)) van thai cao*.