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