Perhaps you should try some spelling variations:
augmentation techniques » imputation techniques
segmentation techniques » imputation techniques
tool augmentation » data augmentation, tool orientation
n segmentation » 3d segmentation
based tool » based two
based n » based _, based k, based no2

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• Performing a fuzzy search may retrieve terms with similar spellings: (( learning-based tool augmentation techniques ) or ( learning-based n segmentation techniques ))~.
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