Perhaps you should try some spelling variations:
imputation techniques » implantation technique, augmentation techniques, segmentation techniques
limitation techniques » mitigation techniques, augmentation techniques, segmentation techniques
co limitation » food limitation, _ limitations
based no2 » based n
based co » based code, based two, based _

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 no2 imputation techniques ) or ( learning-based co limitation techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based no2 imputation techniques ) OR ( learning-based co limitation techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based no2 imputation techniques ) or ( learning-based co limitation techniques ))*.