Perhaps you should try some spelling variations:
"modified ddorcamplexity approximation algorithms" » "modified complexity approximation algorithms"
"modified ohca convolution algorithms" » "modified ohca evolution algorithm", "modified ohca solution algorithm", "modified orca convolution 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 ohca convolution algorithms") or ("modified ddorcamplexity approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified ohca convolution algorithms") OR ("modified ddorcamplexity approximation algorithms")).
• Removing quotes may allow a broader search: (( modified ohca convolution algorithms ) or ( modified ddorcamplexity approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified ohca convolution algorithms") or ("modified ddorcamplexity approximation algorithms"))*.