Perhaps you should try some spelling variations:
"mathematical and computational physical" » "mathematical and computational physics", "mathematical and computation physical", "mathematical and computational biophysical"
"mathematical and combustion physical" » "mathematical and combustion chemical", "mathematical and combustion numerical"

Try widening your search to All Fields.

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: (("mathematical and computational physical") OR ("mathematical and combustion physical")).
• Removing quotes may allow a broader search: (( mathematical and computational physical ) or ( mathematical and combustion physical )).
• Adding a wildcard symbol may retrieve word variants: (("mathematical and computational physical") or ("mathematical and combustion physical"))*.