Perhaps you should try some spelling variations:
"a simulation algorithms" » "a estimation algorithms", "a optimization algorithms", "a solution algorithm", "_ simulation algorithms"
"jose estimation algorithm" » "pose estimation algorithm", "cover estimations algorithm", "pulses estimation algorithm"
"risk estimation algorithm" » "pose estimation algorithm"

Try widening your search to All Fields.

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