Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
trinh vat » trinh van, trinh luat, sinh vat
ho chieu » theo chieu, hoc thieu, doi chieu
trinh va » trinh van, trinh ve, trinh vi
cong tan » cong tac, cong san, cong thanh
hang dau » hang va, hang tai

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) OR (trinh vat)) nhung cong tan ((hang dau) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - canh ((trinh va) OR (trinh vat)) nhung cong tan ((hang dau) or (phan tu))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - canh ((trinh va) OR (trinh vat)) nhung cong tan ((hang dau) or (phan tu))*.