Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
thoai cac » tai cac, thong cac, tho cac
anh tang » anh bang, anh dang, anh nang
cong van » cong vang, cong san, song van
thai cao » tai cao, thuat cao, toan 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 van ((thai cao) OR (thoai cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - anh tang va nhung cong van ((thai cao) OR (thoai cac)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu lang)) - anh tang va nhung cong van ((thai cao) OR (thoai cac))".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - anh tang va nhung cong van ((thai cao) OR (thoai cac))*.