Perhaps you should try some spelling variations:
"post optimization algorithms" » "post optimisation algorithm", "post estimation algorithms", "post estimation algorithm", "robust optimization algorithms", "qoe optimization algorithms", "policy optimization algorithms"
"_ optimizer algorithms" » "_ optimized algorithm", "_ optimize algorithms", "_ optimise algorithms"
"_ optimized algorithms" » "_ optimized algorithm"

Try widening your search to All Fields.

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