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 estimation algorithms" » "modified objective estimation algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective allocation 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 estimation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified thermal approximation algorithm") OR ("modified objective estimation algorithms")).
• Removing quotes may allow a broader search: (( modified thermal approximation algorithm ) or ( modified objective estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified thermal approximation algorithm") or ("modified objective estimation algorithms"))*.