Perhaps you should try some spelling variations:
limitation techniques » imputation techniques, mitigation techniques, augmentation techniques
reduction technique » reduction techniques, truncation technique
ko2 limitation » co limitation, food limitation
n reduction » _ reduction, _ prediction, _ production
based ko2 » based no2, based co, based k
based n » based _, based k, based no2

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( learning-based n reduction technique ) or ( learning-based ko2 limitation techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based n reduction technique ) OR ( learning-based ko2 limitation techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based n reduction technique ) or ( learning-based ko2 limitation techniques ))*.