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