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