Perhaps you should try some spelling variations:
tranh quang » trinh quang, tinh quang, trinh quan
chieu xanh » chieu sach, chieu sang, chieu tinh
chong cong » cong cong, thong cong, cuong cong
ho chieu » theo chieu, hoc thieu, doi chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu xanh - canh ((tranh quang) OR (tran quang)) chong cong tac toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - canh ((tranh quang) OR (tran quang)) chong cong tac toan ban".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - canh ((tranh quang) OR (tran quang)) chong cong tac toan ban*.