Perhaps you should try some spelling variations:
"modified co evolutionary algorithm" » "modified co evolution algorithm", "modified co solution algorithm", "modified _ evolutionary algorithm", "modified df evolutionary algorithm", "modified orca evolutionary algorithm"
"modified coverage approximation algorithms" » "modified average approximation algorithms", "modified _verage approximation algorithms", "modified dfverage approximation algorithms", "modified orcaverage approximation algorithms"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified co evolutionary algorithm") or ("modified coverage approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified co evolutionary algorithm") OR ("modified coverage approximation algorithms")).
• Removing quotes may allow a broader search: (( modified co evolutionary algorithm ) or ( modified coverage approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified co evolutionary algorithm") or ("modified coverage approximation algorithms"))*.