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