Perhaps you should try some spelling variations:
imputation techniques » implantation technique, augmentation techniques, segmentation techniques
reduction techniques » reduction technique
k imputation » _ computation, _ reputation
based h2o2 » based no2
based k » based _, based n, based 3d

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( learning-based h2o2 reduction techniques ) or ( learning-based k imputation techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based h2o2 reduction techniques ) OR ( learning-based k imputation techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based h2o2 reduction techniques ) or ( learning-based k imputation techniques ))*.