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