Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hanh tranh » canh tranh, hanh trinh, hanh trang
theo chieu » theo tieu, ho chieu, thi chieu
cua thuong » cua truong, cua phuong, ca thuong
tranh cua » doanh cua, manh cua
theo chu » cho chu, chao chu, theo yeu
tap toan » tap quan, bai toan
tap doan » tap quan

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) or (theo chu)) xanh - hanh tranh cua thuong cong ((tap toan) OR (tap doan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo chu)) xanh - hanh tranh cua thuong cong ((tap toan) OR (tap doan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo chu)) xanh - hanh tranh cua thuong cong ((tap toan) OR (tap doan)) ban".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo chu)) xanh - hanh tranh cua thuong cong ((tap toan) OR (tap doan)) ban*.