Perhaps you should try some spelling variations:
"risk estimation algorithms" » "risk estimation algorithm", "risk optimization algorithms", "risk optimisation algorithm", "pose estimation algorithms"
"doan optimizer algorithms" » "doan optimized algorithm", "doan optimization algorithms", "doanh optimizer algorithms", "dan optimizer algorithms", "toan optimizer algorithms"
"_ optimized algorithms" » "_ optimized algorithm", "_ optimization algorithms"

Try widening your search to All Fields.

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

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