Perhaps you should try some spelling variations:
"learning-based k augmentation techniques" » "learning-based k segmentation techniques", "learning-based data augmentation techniques", "learning-based _ augmentation techniques", "learning-based n augmentation techniques", "learning-based 3d augmentation techniques"
"learning-based data imputation techniques" » "learning-based data implantation technique", "learning-based data segmentation techniques", "learning-based data floatation technique"

Try widening your search to All Fields.

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