Perhaps you should try some spelling variations:
"learning-based co inhalation technique" » "learning-based co floatation technique", "learning-based co implantation technique", "learning-based co imputation techniques", "learning-based _ inhalation technique", "learning-based code inhalation technique", "learning-based no2 inhalation technique", "learning-based two inhalation technique"
"learning-based co reduction technique" » "learning-based co reduction techniques", "learning-based co truncation technique", "learning-based _ reduction technique", "learning-based h2o2 reduction technique", "learning-based closed reduction technique", "learning-based code reduction technique", "learning-based no2 reduction technique", "learning-based two reduction technique"

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 co reduction technique"))~.
• Removing quotes may allow a broader search: (( learning-based co inhalation technique ) or ( learning-based co reduction technique ))~.
• Adding a wildcard symbol may retrieve word variants: (("learning-based co inhalation technique") or ("learning-based co reduction technique"))*.