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

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 n reduction technique ) or ( learning-based k imputation techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based n reduction technique ) OR ( learning-based k imputation techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based n reduction technique ) or ( learning-based k imputation techniques ))*.