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