Perhaps you should try some spelling variations:
"modified thermal approximation algorithm" » "modified thermal approximation algorithms", "modified average approximation algorithm", "modified thermal oxidation algorithm", "modified time approximation algorithm"
"modified objective solution algorithm" » "modified objective evolutionary algorithm", "modified objective allocation algorithm", "modified objective evolution 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 algorithm") or ("modified objective solution algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified thermal approximation algorithm") OR ("modified objective solution algorithm")).
• Removing quotes may allow a broader search: (( modified thermal approximation algorithm ) or ( modified objective solution algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified thermal approximation algorithm") or ("modified objective solution algorithm"))*.