Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
nhanh mang » nhanh lang, hanh mang, nhanh quang
dung cong » dung trong
hang cong » dang cong, hang nong, bang cong
mang cua » manh cua, dung cua, ban cua
than cap » khan cap, thanh lap, thanh cac
khan ap » khan cap, han ap, khan dam

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 - nhanh mang cua ((dung cong) OR (hang cong)) dan ((than cap) OR (khan ap))~.
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - nhanh mang cua ((dung cong) or (hang cong)) dan ((than cap) or (khan ap))*.