Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
thanh hoa » thanh pho
van dung » van dong, xay dung, tin dung
va dung » va duong, vat dung, va ung
hoa cac » hoa chat, chon cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (chieu sang)) - canh tranh ((va dung) or (van dung)) cong thanh hoa cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chieu sang)) - canh tranh ((va dung) OR (van dung)) cong thanh hoa cac.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (chieu sang)) - canh tranh ((va dung) or (van dung)) cong thanh hoa cac*.