Perhaps you should try some spelling variations:
"modified _ optimization algorithms" » "modified _ optimisation algorithm", "modified _ estimation algorithms", "modified _ estimation algorithm"
"modified objective optimisation algorithms" » "modified objective optimisation algorithm", "modified objective estimation algorithms", "modified objective estimation algorithm", "modified objective optimization algorithms", "modified multiobjective optimization algorithms"

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

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