Perhaps you should try some spelling variations:
"don optimization algorithms" » "don optimisation algorithm", "don estimation algorithms", "don estimation algorithm", "don optimisation algorithms", "don estimation algorithmss", "qoe optimization algorithms", "game optimization algorithms", "_ optimisation algorithms"
"_ optimization algorithm" » "_ optimisation algorithm", "_ estimation algorithm", "_ estimation algorithms"
"_ optimizer algorithms" » "_ optimized algorithms", "_ optimized algorithm", "_ optimize algorithms", "_ optimise algorithms"

Try widening your search to All Fields.

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