Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh luan » trinh luat, trinh quan, trinh han
chua xang » chua nang, chuc nang, chu bang
luan hoan » luan van
hoan nong » hoa nong, hoang long, hoang cong
chu xanh » chu manh, chieu xanh, chuc danh
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai 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 ((chu xanh) OR (chua xang)) - canh trinh luan hoan nong ((tan toan) or (tap toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu xanh) OR (chua xang)) - canh trinh luan hoan nong ((tan toan) OR (tap toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu xanh) OR (chua xang)) - canh trinh luan hoan nong ((tan toan) or (tap toan)) cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chu xanh) OR (chua xang)) - canh trinh luan hoan nong ((tan toan) or (tap toan)) cao*.