Perhaps you should try some spelling variations:
variational segmentation » variational formulation, variational iteration
estimation segmentation » restoration segmentation, optimization segmentation, formation segmentation
method decision » methods decision, method precision, method design
decision get » decisions get, decision agent, decision gate
get libre » de libre

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• Performing a fuzzy search may retrieve terms with similar spellings: ((variational segmentation) or (estimation segmentation)) method decision get libre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((variational segmentation) OR (estimation segmentation)) method decision get libre.
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