Perhaps you should try some spelling variations:
"parameters estimation algorithmssssss" » "parameters estimation algorithms", "parameters estimation algorithm", "parameter estimation algorithmssssss", "parameter estimates algorithmssssss", "parameter optimization algorithmssssss"
"attributes optimization algorithms" » "attribute optimization algorithms", "attributes optimisation algorithm", "attributes estimation algorithms", "attributes estimation algorithm"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("parameters estimation algorithmssssss") OR ("attributes optimization algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"parameters estimation algorithmssssss\") OR (\"attributes optimization algorithms\"))".
• Removing quotes may allow a broader search: (( parameters estimation algorithmssssss ) OR ( attributes optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("parameters estimation algorithmssssss") OR ("attributes optimization algorithms"))*.