Perhaps you should try some spelling variations:
"modified up convolution algorithms" » "modified up evolution algorithm", "modified up solution algorithm", "modified _ convolution algorithms", "modified df convolution algorithms", "modified bi1 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 up convolution algorithms") or ("modified allocation optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified up convolution algorithms") OR ("modified allocation optimization algorithm")).
• Removing quotes may allow a broader search: (( modified up convolution algorithms ) or ( modified allocation optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified up convolution algorithms") or ("modified allocation optimization algorithm"))*.