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