Perhaps you should try some spelling variations:
"modified objective estimation algorithm" » "modified objective optimization algorithm", "modified objective allocation algorithm"
"modified deep solution algorithm" » "modified deep evolution algorithm", "modified deep convolution algorithms", "modified deep evolutionary algorithm", "modified delphi solution algorithm", "modified df solution algorithm", "modified near solution algorithm", "modified drug solution algorithm"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified objective estimation algorithm") OR ("modified deep solution algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified objective estimation algorithm\") OR (\"modified deep solution algorithm\"))*".
• Removing quotes may allow a broader search: (( modified objective estimation algorithm ) OR ( modified deep solution algorithm ))*.