Perhaps you should try some spelling variations:
limitation techniques » imputation techniques, mitigation techniques, augmentation techniques
floatation technique » inhalation technique, implantation technique, imputation techniques
no2 floatation » _ floatation
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.

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