Perhaps you should try some spelling variations:
"modified allocation optimisation algorithm" » "modified allocation optimization algorithm", "modified allocation optimization algorithms", "modified allocation estimation algorithm", "modified allocation estimation algorithms"
"modified optimal convolution algorithms" » "modified optimal evolution algorithm", "modified optimal solution algorithm", "modified optimal solution algorithms", "modified thermal convolution algorithms"

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