Perhaps you should try some spelling variations:
limitation techniques » imputation techniques, mitigation techniques, augmentation techniques
floatation technique » inhalation technique, implantation technique, imputation techniques
two limitation » co limitation, food limitation
co floatation » _ floatation
based two » based tool
based co » based code, based no2, 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 two limitation techniques ) OR ( learning-based co floatation technique ))~.
• Adding a wildcard symbol may retrieve word variants: (( learning-based two limitation techniques ) or ( learning-based co floatation technique ))*.