Perhaps you should try some spelling variations:
"modified objective optimisation algorithm" » "modified objective optimization algorithm", "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective estimation algorithm", "modified objective estimation algorithms"
"machines using metal algorithm" » "machinery using metal algorithm", "machines using real algorithm", "machines nursing mental algorithm", "machines using medical algorithm"

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

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