Perhaps you should try some spelling variations:
"parabolic differential equation" » "partial differential equation", "parabolic differential equations"
"metabolic differences equations" » "metabolic disturbances equations", "ethnic differences equations", "metabolism references equations", "metabolic difference equation", "metabolic differential equations", "metabolic differentes situations"
"parabolic difference equations" » "analytic difference equations", "parabolic differential equations"

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: (("parabolic differential equation") OR ((("parabolic difference equations") OR ("metabolic differences equations")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"parabolic differential equation\") or (((\"parabolic difference equations\") OR (\"metabolic differences equations\"))))".
• Removing quotes may allow a broader search: (( parabolic differential equation ) or ((( parabolic difference equations ) OR ( metabolic differences equations )))).
• Adding a wildcard symbol may retrieve word variants: (("parabolic differential equation") or ((("parabolic difference equations") OR ("metabolic differences equations"))))*.