Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimisation algorithm"
"machines using search algorithm" » "machines using source algorithm", "machinery using search algorithm", "machines using egarch algorithm", "machines nursing research algorithm", "machines using servo 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 multiobjective estimation algorithms") OR ("machines using search algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified multiobjective estimation algorithms\") OR (\"machines using search algorithm\"))".
• Removing quotes may allow a broader search: (( modified multiobjective estimation algorithms ) OR ( machines using search algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective estimation algorithms") OR ("machines using search algorithm"))*.