Perhaps you should try some spelling variations:
"modified static approximation algorithms" » "modified time approximation algorithms"
"modified adaptive evolution algorithm" » "modified adaptive solution algorithm", "modified adaptive evolutionary algorithm", "modified adaptive convolution algorithms", "modified adaptive ventilation algorithm", "modified passive evolution algorithm"

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

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