Perhaps you should try some spelling variations:
"modified invasive evolutionary algorithm" » "modified invasive evolution algorithm", "modified invasive solution algorithm", "modified passive evolutionary algorithm"
"modified df approximation algorithms" » "modified _ approximation algorithms", "modified one approximation algorithms", "modified time approximation algorithms", "modified adam approximation algorithms", "modified bi1 approximation algorithms"

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

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