Perhaps you should try some spelling variations:
"modified objective optimisation algorithm" » "modified objective optimization algorithm", "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective estimation algorithm", "modified objective estimation algorithms"
"mapping nursing methods algorithm" » "impacting nursing methods algorithm", "mapping learning methods algorithm", "mapping nursing method algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"mapping nursing methods algorithm\") OR (\"modified objective optimisation algorithm\"))~".
• Removing quotes may allow a broader search: (( mapping nursing methods algorithm ) OR ( modified objective optimisation algorithm ))~.
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