Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
theo chieu » theo tieu, ho chieu, thi chieu
trinh kha » trinh khoa, trinh khai, trinh kham
nang nong » nang song, hang nong, nang dong
manh toan » thanh toan, anh tuan, tinh toan
theo chu » cho chu, chao chu, theo yeu
kha nang » phap nang, ky nang, ki nang
san toan » van toan, dan toan, xuan toan

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