Perhaps you should try some spelling variations:
nhung xuong » nhung huong, nhung tuong, nhung phuong
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
xuong dan » huong dan, xuong san, tuong dan
van hanh » van thanh, ban hanh, van anh
hanh va » hang va, hanh vi
han tu » hanh tu, ban tu, van tu

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 - van hanh va nhung xuong dan ((phan tu) OR (han tu))~.
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - van hanh va nhung xuong dan ((phan tu) or (han tu))*.