Perhaps you should try some spelling variations:
"modified sales convolution algorithms" » "modified sales evolution algorithm", "modified sales solution algorithm", "modified sales evolution algorithms", "modified male convolution algorithms", "modified traces convolution algorithms"
"modified allocation optimization algorithm" » "modified allocation optimization algorithms", "modified allocation optimisation algorithm", "modified allocation estimation algorithm", "modified location optimization algorithm"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified sales convolution algorithms") or ("modified allocation optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified sales convolution algorithms") OR ("modified allocation optimization algorithm")).
• Removing quotes may allow a broader search: (( modified sales convolution algorithms ) or ( modified allocation optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified sales convolution algorithms") or ("modified allocation optimization algorithm"))*.