Perhaps you should try some spelling variations:
"modified thermal approximation algorithms" » "modified average approximation algorithms", "modified thermal oxidation algorithms", "modified time approximation algorithms"
"modified objective evolution algorithm" » "modified objective evolutionary algorithm", "modified objective allocation algorithm", "modified objective solution algorithm", "modified objective convolution algorithms"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified thermal approximation algorithms") or ("modified objective evolution algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified thermal approximation algorithms") OR ("modified objective evolution algorithm")).
• Removing quotes may allow a broader search: (( modified thermal approximation algorithms ) or ( modified objective evolution algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified thermal approximation algorithms") or ("modified objective evolution algorithm"))*.