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

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