Perhaps you should try some spelling variations:
"modified multiobjective optimizer algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective optimized algorithms", "modified multiobjective optimized algorithm"
"machines using force algorithm" » "machines using source algorithm", "machines using search algorithm", "machinery using force algorithm", "machines using morse algorithm", "machines cutting force 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: "((\"machines using force algorithm\") OR (\"modified multiobjective optimizer algorithms\"))~".
• Removing quotes may allow a broader search: (( machines using force algorithm ) OR ( modified multiobjective optimizer algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("machines using force algorithm") OR ("modified multiobjective optimizer algorithms"))*.