Perhaps you should try some spelling variations:
"modified objective allocation algorithms" » "modified objective estimation algorithms", "modified objective approximation algorithms"
"modified time solution algorithm" » "modified time evolution algorithm", "modified time convolution algorithms", "modified time evolutionary algorithm", "modified bi1 solution algorithm", "modified male solution algorithm", "modified time solutions algorithm", "modified optimal solution algorithm"

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