Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
tuong cong » truong cong, trong cong, tong cong
doi chieu » doc hieu, doi chi, ho chieu
trung cap » truong cao, trung tam
trung ha » trung hoc, trung tam
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 - hanh ((trung ha) or (trung cap)) tuong cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - hanh ((trung ha) OR (trung cap)) tuong cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - hanh ((trung ha) or (trung cap)) tuong cong dan toan cau*.