Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
theo chieu » theo tieu, ho chieu, thi chieu
hanh tinh » nhanh tinh, thanh tinh, canh tinh
chat tong » chat trong, chat long, chat cong
tong cong » trong cong, cong cong, dung cong
theo chu » cho chu, chao chu, theo yeu
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)) sach - ((hanh tinh) OR (hanh trinh)) chat tong cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo chu)) sach - ((hanh tinh) OR (hanh trinh)) chat tong cong san toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo chu)) sach - ((hanh tinh) OR (hanh trinh)) chat tong cong san toan cau*".