Perhaps you should try some spelling variations:
"modified objective estimation algorithms" » "modified objective estimation algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective allocation algorithms"
"mobile learning method algorithm" » "mobile learning mom algorithm", "machine learning method algorithm", "mobile learning methods algorithm", "mobile graining methods algorithm", "mobile 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: "((\"modified objective estimation algorithms\") OR (\"mobile learning method algorithm\"))~".
• Removing quotes may allow a broader search: (( modified objective estimation algorithms ) OR ( mobile learning method algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective estimation algorithms") OR ("mobile learning method algorithm"))*.