Perhaps you should try some spelling variations:
"_ optimisation algorithm" » "_ optimization algorithms", "_ estimation algorithm", "_ optimization algorithm"
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ approximation algorithms"
"cong optimizer algorithms" » "cong optimized algorithms", "cong optimized algorithm", "cong optimization algorithms", "choosing optimizer algorithms"

Try widening your search to All Fields.

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