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