Perhaps you should try some spelling variations:
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective estimation algorithms"
"machines learning estimation algorithm" » "machines learning emotion algorithm", "machines lighting estimation algorithm", "machine learning estimation algorithm", "active learning estimation algorithm", "mapping learning estimation 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: "((\"machines learning estimation algorithm\") OR (\"modified objective optimization algorithm\"))~".
• Removing quotes may allow a broader search: (( machines learning estimation algorithm ) OR ( modified objective optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("machines learning estimation algorithm") OR ("modified objective optimization algorithm"))*.