Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
trinh vat » trinh luat, sinh vat, trinh han
trinh van » trinh han, trinh quan, trinh toan
ban thanh » ban hanh, ban hang
ban than » van thanh, ban hang, ban hanh

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: theo chieu xanh - canh ((trinh vat) OR (trinh van)) nhung cong ((ban than) OR (ban thanh)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - canh ((trinh vat) or (trinh van)) nhung cong ((ban than) OR (ban thanh)) cau~".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - canh ((trinh vat) or (trinh van)) nhung cong ((ban than) OR (ban thanh)) cau*.