Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
theo chieu » theo tieu, ho chieu, thi chieu
chua nang » chuc nang, kha nang, cuu nang
chua xang » chuc nang, chu bang, chua dong
theo chu » cho chu, chao chu, theo yeu
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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 - hanh trinh ((chua nang) OR (chua xang)) cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo chu)) xanh - hanh trinh ((chua nang) OR (chua xang)) cong tap toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo chu)) xanh - hanh trinh ((chua nang) OR (chua xang)) cong tap toan cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo chu)) xanh - hanh trinh ((chua nang) OR (chua xang)) cong tap toan cao*.