Perhaps you should try some spelling variations:
"modified location estimation algorithms" » "modified location estimation algorithm", "modified location optimization algorithms", "modified location optimisation algorithm", "modified motion estimation algorithms", "modified carbon estimation algorithms"
"modified learning method algorithm" » "mobile learning method algorithm", "modified caging method algorithm", "modified learning mom algorithm", "modified learning methods algorithm", "modified graining methods algorithm", "modified learning emotion algorithm"

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