Perhaps you should try some spelling variations:
implementation problems » implementation process, complementarity problems, implementation plans
implementation program » implementation process, implementation plan, implementation part
desorption from » description from, adsorption from, absorption from
from siberia » from liberia, from nigeria, from sierra

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

• Performing a fuzzy search may retrieve terms with similar spellings: innovation ((implementation problems) or (implementation program)) desorption from siberia~.
• If you are trying to use Boolean operators, they must be ALL CAPS: innovation ((implementation problems) OR (implementation program)) desorption from siberia.
• Adding a wildcard symbol may retrieve word variants: innovation ((implementation problems) or (implementation program)) desorption from siberia*.