Perhaps you should try some spelling variations:
"modified invasive estimation algorithms" » "modified invasive estimation algorithm", "modified invasive optimization algorithms", "modified invasive optimisation algorithm", "modified invasive ventilation algorithms", "modified passive estimation algorithms"
"modified delphi evolution algorithm" » "modified delphi solution algorithm", "modified delphi evolutionary algorithm", "modified delphi convolution algorithms"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified delphi evolution algorithm") or ("modified invasive estimation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified delphi evolution algorithm") OR ("modified invasive estimation algorithms")).
• Removing quotes may allow a broader search: (( modified delphi evolution algorithm ) or ( modified invasive estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified delphi evolution algorithm") or ("modified invasive estimation algorithms"))*.