Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
optimizer algorithms » optimized algorithms, optimization algorithms
market approximation » one approximation, time approximation
optimized algorithm » optimized algorithms
cover » covers, over

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• Performing a fuzzy search may retrieve terms with similar spellings: (( cover ((optimizer algorithms) OR (optimized algorithm)) ) or ( market approximation algorithm ))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cover ((optimizer algorithms) OR (optimized algorithm)) ) or ( market approximation algorithm ))".
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