Perhaps you should try some spelling variations:
imputation techniques » implantation technique, augmentation techniques, segmentation techniques
reduction technique » reduction techniques, truncation technique
3d reduction » _ reduction
based two » based tool, based co
based 3d » based _, based co, based k

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 two imputation techniques ) or ( learning-based 3d reduction technique ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based two imputation techniques ) OR ( learning-based 3d reduction technique )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based two imputation techniques ) or ( learning-based 3d reduction technique ))*.