Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
theo chieu » theo tieu, ho chieu, thi chieu
theo chu » cho chu, chao chu, theo yeu
hoa bang » hoa lang, hoa nang, hoach bang
hoa vang » hoa lang, hoa van, hoa nang
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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 - canh trinh ((hoa bang) OR (hoa vang)) cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo chu)) xanh - canh trinh ((hoa bang) OR (hoa vang)) cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo chu)) xanh - canh trinh ((hoa bang) OR (hoa vang)) cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo chu)) xanh - canh trinh ((hoa bang) OR (hoa vang)) cong san toan cau*.