Talvez debería tentar con algunhas variantes ortográficas:
implementation problems » implementation process, complementarity problems, implementation plans
implementation program » implementation process, implementation plan, implementation part
absorption from » absorption room, absorption flame, absorption drug
from liberia » from siberia, from nigeria, from liver

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)) absorption from liberia~.
• If you are trying to use Boolean operators, they must be ALL CAPS: innovation ((implementation problems) OR (implementation program)) absorption from liberia.
• Adding a wildcard symbol may retrieve word variants: innovation ((implementation problems) or (implementation program)) absorption from liberia*.