Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
canh trinh » canh tranh, hanh trinh, canh tinh
ho chieu » theo chieu, hoc thieu, doi chieu
trinh va » trinh van, trinh vat, trinh ve
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
phan cau » phan dau, phan cac, phan lap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu xanh - canh trinh va nhung ((cong tan) OR (cong san)) ((phan cau) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - canh trinh va nhung ((cong tan) OR (cong san)) ((phan cau) or (phan tu))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - canh trinh va nhung ((cong tan) OR (cong san)) ((phan cau) or (phan tu))*.