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

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