Perhaps you should try some spelling variations:
imputation techniques » implantation technique, augmentation techniques, segmentation techniques
floatation technique » inhalation technique, implantation technique, truncation technique
co imputation » co limitation
based ko2de » based code, based border
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 ko2de floatation technique ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based co imputation techniques ) OR ( learning-based ko2de floatation technique )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based co imputation techniques ) or ( learning-based ko2de floatation technique ))*.