Perhaps you should try some spelling variations:
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ optimisation algorithm"
"cost optimized algorithms" » "cost optimizer algorithms", "cost optimization algorithms", "cost optimizer algorithmss", "most optimized algorithms"
"cost optimized algorithm" » "cost optimizer algorithms", "most optimized algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("_ estimation algorithms") or ((("cost optimized algorithm") OR ("cost optimized algorithms"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("_ estimation algorithms") OR ((("cost optimized algorithm") OR ("cost optimized algorithms")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"_ estimation algorithms\") or (((\"cost optimized algorithm\") OR (\"cost optimized algorithms\"))))".
• Removing quotes may allow a broader search: (( _ estimation algorithms ) or ((( cost optimized algorithm ) OR ( cost optimized algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("_ estimation algorithms") or ((("cost optimized algorithm") OR ("cost optimized algorithms"))))*.