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

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