Perhaps you should try some spelling variations:
"modified _ estimation algorithmssss" » "modified _ estimation algorithms", "modified _ estimation algorithm"
"modified parameters optimization algorithm" » "modified parameter optimization algorithm", "modified parameter estimation algorithm", "modified parameters optimization algorithms", "modified parameters optimisation algorithm", "modified parameters 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: (("modified _ estimation algorithmssss") OR ("modified parameters optimization algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified _ estimation algorithmssss\") OR (\"modified parameters optimization algorithm\"))".
• Removing quotes may allow a broader search: (( modified _ estimation algorithmssss ) OR ( modified parameters optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified _ estimation algorithmssss") OR ("modified parameters optimization algorithm"))*.