Perhaps you should try some spelling variations:
"_ optimization algorithm" » "_ optimization algorithms", "_ optimisation algorithm", "_ estimation algorithm"
"risk optimizer algorithms" » "risk optimized algorithms", "risk optimization algorithms"
"risk optimized algorithm" » "risk optimized algorithms", "write optimized algorithm"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("_ optimization algorithm") or ((("risk optimizer algorithms") OR ("risk optimized algorithm"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("_ optimization algorithm") OR ((("risk optimizer algorithms") OR ("risk optimized algorithm")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"_ optimization algorithm\") or (((\"risk optimizer algorithms\") OR (\"risk optimized algorithm\"))))".
• Removing quotes may allow a broader search: (( _ optimization algorithm ) or ((( risk optimizer algorithms ) OR ( risk optimized algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("_ optimization algorithm") or ((("risk optimizer algorithms") OR ("risk optimized algorithm"))))*.