Perhaps you should try some spelling variations:
"differential equation" » "difference equations"
"differential equations" » "difference equationss"
"difference equationss" » "difference equations", "difference equation", "difference equations0.4"
"differenced equations" » "difference equations", "difference equation", "differental equations"
"differences equations" » "difference equations", "difference equation", "differentes situations"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("differential equation") OR ((("differential equations") OR ((((("difference equationss") OR ("differenced equations"))) OR ("differences equations"))))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"differential equation\") or (((\"differential equations\") or (((((\"difference equationss\") OR (\"differenced equations\"))) or (\"differences equations\"))))))*".
• Removing quotes may allow a broader search: (( differential equation ) or ((( differential equations ) or ((((( difference equationss ) OR ( differenced equations ))) or ( differences equations ))))))*.