Perhaps you should try some spelling variations:
thanh luong » thanh huong, thanh long, thanh cuong
chieu sang » chieu sach, chieu xanh, nhieu tang
luong khoa » dung khoa
cong thanh » dong thanh, cong trinh, cong tan
hieu lang » hieu quang, nhieu tang, hieu van
khoa dung » hoc dung, khoa cong
dung cong » dung trong
hang cau » hang dau, hang ca, nhung cau

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 luong khoa dung cong thanh ((hang cau) or (hang va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - thanh luong khoa dung cong thanh ((hang cau) OR (hang va)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) OR (hieu lang)) - thanh luong khoa dung cong thanh ((hang cau) or (hang va))".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) OR (hieu lang)) - thanh luong khoa dung cong thanh ((hang cau) or (hang va))*.