Perhaps you should try some spelling variations:
"post estimation algorithms" » "post estimation algorithm", "post optimization algorithms", "post optimisation algorithm", "pose estimation algorithms", "risk estimation algorithms", "pulses estimation algorithms"
"via simulation algorithm" » "via estimation algorithm", "via solution algorithm", "via optimisation algorithm", "_ simulation algorithm", "3d simulation algorithm", "mri simulation algorithm", "vi_ simulation algorithm"
"a simulation algorithm" » "a estimation algorithm", "a solution algorithm", "a optimisation algorithm", "_ simulation algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("post estimation algorithms") or ((("via simulation algorithm") OR ("a simulation algorithm"))))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"post estimation algorithms\") or (((\"via simulation algorithm\") OR (\"a simulation algorithm\"))))".
• Removing quotes may allow a broader search: (( post estimation algorithms ) or ((( via simulation algorithm ) OR ( a simulation algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("post estimation algorithms") or ((("via simulation algorithm") OR ("a simulation algorithm"))))*.