Perhaps you should try some spelling variations:
"policy optimization algorithm" » "policy optimization algorithms", "policy optimisation algorithm", "policy estimation algorithm", "topology optimization algorithm"
"a estimation algorithms" » "a estimation algorithm", "a optimization algorithms", "a optimisation algorithm", "_ estimation algorithms", "a destination algorithms", "_ estimating algorithms"
"_ solution algorithm" » "_ evolution algorithm", "_ convolution algorithms", "_ evolutionary algorithm", "_ solutions 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: (((("a estimation algorithms") OR ("_ solution algorithm"))) OR ("policy optimization algorithm"))~.
• Removing quotes may allow a broader search: (((( a estimation algorithms ) or ( _ solution algorithm ))) or ( policy optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (((("a estimation algorithms") or ("_ solution algorithm"))) or ("policy optimization algorithm"))*.