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

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