Perhaps you should try some spelling variations:
"notion optimisation algorithmsssssssssssssssss" » "notion optimization algorithmssssssssssssssssss", "notion estimation algorithmsssssssssssssssss", "notion estimation algorithmssssssssssssssssss", "network optimization algorithmsssssssssssssssss"
"parameter optimisation algorithm" » "parameter optimization algorithms", "parameter estimation algorithm", "parameter estimation algorithms", "parameter optimization 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: (("notion optimisation algorithmsssssssssssssssss") or ("parameter optimisation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("notion optimisation algorithmsssssssssssssssss") OR ("parameter optimisation algorithm")).
• Removing quotes may allow a broader search: (( notion optimisation algorithmsssssssssssssssss ) or ( parameter optimisation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("notion optimisation algorithmsssssssssssssssss") or ("parameter optimisation algorithm"))*.