Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh huong » thanh huong, anh huong, manh huong
huong cua » dung cua
cong cong » trong cong, dung cong, dang cong
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - hanh huong cua ((cong cong) OR (cong dong)) tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - hanh huong cua ((cong cong) OR (cong dong)) tac toan cau*.