Perhaps you should try some spelling variations:
"defined network estimation algorithms" » "defined network estimation algorithm", "defined network optimization algorithms", "defined network optimisation algorithm", "designed network 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"defined network estimation algorithms\") OR (\"modified learning method algorithm\"))~".
• Removing quotes may allow a broader search: (( defined network estimation algorithms ) OR ( modified learning method algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("defined network estimation algorithms") OR ("modified learning method algorithm"))*.