Perhaps you should try some spelling variations:
"a simulation algorithm" » "a solution algorithm", "a optimisation algorithm", "a estimation algorithms", "_ simulation algorithm"
"pose approximation algorithms" » "one approximation algorithms", "time approximation algorithms", "_ approximation algorithms"
"a estimation algorithm" » "_ estimation algorithm", "a destination algorithm", "_ estimating algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("a simulation algorithm") or ("a estimation algorithm"))) or ("pose approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("a simulation algorithm") OR ("a estimation algorithm"))) OR ("pose approximation algorithms")).
• Removing quotes may allow a broader search: (((( a simulation algorithm ) or ( a estimation algorithm ))) or ( pose approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (((("a simulation algorithm") or ("a estimation algorithm"))) or ("pose approximation algorithms"))*.