Perhaps you should try some spelling variations:
imputation techniques » implantation technique, augmentation techniques, segmentation techniques
inhalation technique » floatation technique, implantation technique, inhaler technique
co inhalation » _ inhalation
based codeo2 » based code
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 inhalation technique ) or ( learning-based codeo2 imputation techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based co inhalation technique ) OR ( learning-based codeo2 imputation techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based co inhalation technique ) or ( learning-based codeo2 imputation techniques ))*.