Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
khong cong » thong cong, chong cong, khong con
khong cang » thong cong, hong bang, khong dung
tranh cua » doanh cua, manh cua
ho chieu » hoc thieu, doi chieu, mot chieu
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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) OR (ho chieu)) xanh - canh tranh cua ((khong cong) OR (khong cang)) tap toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (ho chieu)) xanh - canh tranh cua ((khong cong) OR (khong cang)) tap toan ban~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (ho chieu)) xanh - canh tranh cua ((khong cong) OR (khong cang)) tap toan ban*.