Perhaps you should try some spelling variations:
tuong chinh » thuong chinh, truong chinh, thong chinh
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
tuong canh » trong canh, tuong lanh, tuong dan
trinh vat » trinh van, trinh luat, sinh vat
trinh va » trinh van, trinh ve, trinh vi

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