Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
chieu xanh » chieu sach, chieu sang, chieu tinh
trinh luan » trinh luat, trinh quan, trinh han
truong dan » truong dang, truong danh, truong dao
luan nang » luan van, van nang, luan san
chu xanh » chu manh, chua xang, chuc danh
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chu xanh) OR (chieu xanh)) - canh trinh luan nang ((truong dan) or (truong dai)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu xanh) OR (chieu xanh)) - canh trinh luan nang ((truong dan) OR (truong dai)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu xanh) OR (chieu xanh)) - canh trinh luan nang ((truong dan) or (truong dai)) toan tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chu xanh) OR (chieu xanh)) - canh trinh luan nang ((truong dan) or (truong dai)) toan tap*.