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