Perhaps you should try some spelling variations:
"modified notion estimation algorithms" » "modified notion estimation algorithm", "modified notion optimization algorithms", "modified notion optimisation algorithm", "modified motion estimation algorithms"
"modified total variation algorithm" » "modified total estimation algorithm", "modified total predation algorithm", "modified global variation algorithm", "modified thermal variation algorithm", "modified ti6al4v variation algorithm"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified total variation algorithm") OR ("modified notion estimation algorithms"))~.
• Removing quotes may allow a broader search: (( modified total variation algorithm ) or ( modified notion estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified total variation algorithm") or ("modified notion estimation algorithms"))*.