Perhaps you should try some spelling variations:
combustiveis » combustibles
comestible » combustible, compatible, compressible
combustions » combustion, combustors, combusting
fossilis" » fossils", fossili", fossilised"
fossilied" » fossilized", fossilised", fossilisted"
fossiled" » fossile", fossiles", fossilized"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((combustiveis or comestible) or combustions) (fossilis\" OR (fossilied\" or fossiled\"))~".
• Removing quotes may allow a broader search: ((combustiveis or comestible) or combustions) (fossilis OR (fossilied or fossiled ))~.
• Adding a wildcard symbol may retrieve word variants: "((combustiveis or comestible) or combustions) (fossilis" OR (fossilied" or fossiled"))*.