Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh quan » tinh quang, trinh luat, trinh han
chu quang » chat quang, vu quang
quan dang » quang dang, quan lang, quan dong
dang cong » dung cong
theo chu » theo chieu, cho chu, chao chu
tap toan » tap quan, bai toan
tap doan » tap quan

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 quang - canh trinh quan dang cong ((tap toan) OR (tap doan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu quang - canh trinh quan dang cong ((tap toan) OR (tap doan)) cau".
• Adding a wildcard symbol may retrieve word variants: theo chu quang - canh trinh quan dang cong ((tap toan) OR (tap doan)) cau*.