Perhaps you should try some spelling variations:
nhanh duong » nhanh dong, thanh duong, khanh duong
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
thong cong » trong cong, tong cong, thong thong
chinh can » chinh ca, chinh ban, chinh cau
duong he » duong che, dung he, duong ve
cong tac » cong ty
chan cau » phan cau, can cau, chinh cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu xanh - nhanh duong he thong cong tac ((chan cau) or (chinh can))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - nhanh duong he thong cong tac ((chan cau) OR (chinh can)).
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - nhanh duong he thong cong tac ((chan cau) or (chinh can))*.