Perhaps you should try some spelling variations:
"modified passive estimation algorithms" » "modified passive estimation algorithm", "modified passive optimization algorithms", "modified passive optimisation algorithm", "modified pose estimation algorithms", "modified adaptive 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"

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

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