Perhaps you should try some spelling variations:
"modified passive estimation algorithmssss" » "modified passive estimation algorithms", "modified passive estimation algorithm", "modified pose estimation algorithmssss", "modified adaptive estimation algorithmssss"
"modified bayesian optimization algorithm" » "modified bayesian optimization algorithms", "modified bayesian optimisation algorithm", "modified bayesian estimation algorithm"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified passive estimation algorithmssss") OR ("modified bayesian optimization algorithm"))~.
• Removing quotes may allow a broader search: (( modified passive estimation algorithmssss ) or ( modified bayesian optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified passive estimation algorithmssss") or ("modified bayesian optimization algorithm"))*.