Perhaps you should try some spelling variations:
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ optimisation algorithm"
"risk optimized algorithms" » "risk optimizer algorithms", "risk optimization algorithms", "risk optimizer algorithmss", "write optimized algorithms"
"risk optimized algorithm" » "risk optimizer algorithms", "write optimized 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: (("_ estimation algorithms") OR ((("risk optimized algorithm") OR ("risk optimized algorithms"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"_ estimation algorithms\") or (((\"risk optimized algorithm\") OR (\"risk optimized algorithms\"))))~".
• Removing quotes may allow a broader search: (( _ estimation algorithms ) or ((( risk optimized algorithm ) OR ( risk optimized algorithms ))))~.
• Adding a wildcard symbol may retrieve word variants: (("_ estimation algorithms") or ((("risk optimized algorithm") OR ("risk optimized algorithms"))))*.