Perhaps you should try some spelling variations:
"modified objective optimization algorithms" » "modified objective optimisation algorithm", "modified objective estimation algorithms", "modified objective optimized algorithms", "modified multiobjective optimization algorithms"
"modified a estimation algorithm" » "modified _ estimation algorithm", "modified a destination algorithm", "modified _ estimating algorithm", "modified df estimation algorithm", "modified adam estimation algorithm"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified objective optimization algorithms\") OR (\"modified a estimation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified objective optimization algorithms ) OR ( modified a estimation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective optimization algorithms") OR ("modified a estimation algorithm"))*.