Perhaps you should try some spelling variations:
quantitative approximation » quantitative applications, quantitative association, quantitative information
approximation programs » approximation problems, approximation proofs, approximation problem
based microscopy » based microscope, based microscopic, basic microscopy
programs based » programs case, programming based
https » http

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• Performing a fuzzy search may retrieve terms with similar spellings: quantitative approximation programs based microscopy https~.
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