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