Perhaps you should try some spelling variations:
limitation techniques » imputation techniques, mitigation techniques, augmentation techniques
inhalation technique » floatation technique, implantation technique, imputation techniques
co limitation » food limitation, _ limitations
k inhalation » _ inhalation, k inflation, _ inflation
based co » based code, based no2, based two
based k » based _, based n, based 3d

You may be able to get more results by adjusting your search query.

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