Perhaps you should try some spelling variations:
"modified multiobjective approximation algorithms" » "modified multiobjective optimization algorithms"
"machines using real algorithm" » "machinery using real algorithm", "machines using adam algorithm", "machines using search algorithm", "machines using metal algorithm", "machines using raw 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 real algorithm") or ("modified multiobjective approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("machines using real algorithm") OR ("modified multiobjective approximation algorithms")).
• Removing quotes may allow a broader search: (( machines using real algorithm ) or ( modified multiobjective approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("machines using real algorithm") or ("modified multiobjective approximation algorithms"))*.