Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
van phan » van phong, van thanh, luan phan
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - canh trinh va dung cong ((dan gian) or (van phan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - canh trinh va dung cong ((dan gian) OR (van phan)) cau*.