Perhaps you should try some spelling variations:
"modified make estimation algorithms" » "modified make estimation algorithm", "modified make optimization algorithms", "modified make optimisation algorithm", "modified pose estimation algorithms", "modified male estimation algorithms"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified make estimation algorithms") or ("modified notion approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified make estimation algorithms") OR ("modified notion approximation algorithms"))*.
• Removing quotes may allow a broader search: (( modified make estimation algorithms ) or ( modified notion approximation algorithms ))*.