Perhaps you should try some spelling variations:
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective estimation algorithm"
"modified total approximation algorithms" » "modified one approximation algorithms", "modified time approximation algorithms", "modified rough approximations algorithms", "modified thermal approximation algorithms", "modified ti6al4v approximation algorithms"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified total approximation algorithms\") OR (\"modified objective optimization algorithm\"))~".
• Removing quotes may allow a broader search: (( modified total approximation algorithms ) OR ( modified objective optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified total approximation algorithms") OR ("modified objective optimization algorithm"))*.