Perhaps you should try some spelling variations:
imputation techniques » implantation technique, augmentation techniques, segmentation techniques
reduction technique » reduction techniques, truncation technique
tool reduction » model reduction, h2o2 reduction
co imputation » co limitation
based tool » based two
based co » based code, based no2, based two

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 co imputation techniques ) OR ( learning-based tool reduction technique ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( learning-based co imputation techniques ) OR ( learning-based tool reduction technique ))".
• Adding a wildcard symbol may retrieve word variants: (( learning-based co imputation techniques ) OR ( learning-based tool reduction technique ))*.