Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
canh trinh » canh tranh, hanh trinh, canh tinh
cong toan » cong tan, cong hoan, cong tuan
dong luan » dung luan, tong luan, dong xuan
ho chieu » theo chieu, hoc thieu, doi chieu
trinh va » trinh van, trinh vat, trinh ve
phan cau » phan dau, phan cac, phan tu

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 - canh trinh va nhung ((cong toan) or (dong luan)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - canh trinh va nhung ((cong toan) OR (dong luan)) phan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - canh trinh va nhung ((cong toan) or (dong luan)) phan cau*.