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

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