Perhaps you should try some spelling variations:
trong quan » thong quan, thong quang, luong quan
tong quan » thong quan, tong luan, luong quan
trong san » trong cac, cong san, dong san
cua sinh » hoa sinh, va sinh
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap
va tinh » may tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((va tinh) or (cua sinh)) - lang ((trong quan) OR (tong quan)) dung trong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((va tinh) OR (cua sinh)) - lang ((trong quan) OR (tong quan)) dung trong san toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((va tinh) or (cua sinh)) - lang ((trong quan) OR (tong quan)) dung trong san toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((va tinh) or (cua sinh)) - lang ((trong quan) OR (tong quan)) dung trong san toan cao*.