Perhaps you should try some spelling variations:
"modified network optimization algorithm" » "modified network optimization algorithms", "modified network optimisation algorithm", "modified network estimation algorithm", "certified network optimization algorithm", "defined network optimization algorithm", "modified near optimization 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 network optimization algorithm") OR ("modified df approximation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified network optimization algorithm\") OR (\"modified df approximation algorithms\"))".
• Removing quotes may allow a broader search: (( modified network optimization algorithm ) OR ( modified df approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified network optimization algorithm") OR ("modified df approximation algorithms"))*.