Perhaps you should try some spelling variations:
"learning-based 3d imputation techniques" » "learning-based 3d implantation technique", "learning-based 3d augmentation techniques", "learning-based 3d segmentation techniques", "learning-based 3d simulation techniques", "learning-based _ imputation techniques", "learning-based k imputation techniques", "learning-based n imputation techniques"
"learning-based co floatation technique" » "learning-based co inhalation technique", "learning-based co implantation technique", "learning-based co truncation technique", "learning-based _ floatation technique", "learning-based code floatation technique", "learning-based no2 floatation technique", "learning-based two floatation technique"

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