Perhaps you should try some spelling variations:
"fire and explosion danger in coal lifes" » "fire and explosion danger in coal life" (Expand Search), "fire and explosion danger in coal lines" (Expand Search)
"fire and explosion danger in coal line" » "fire and explosion danger in coal life" (Expand Search), "fire and explosion danger in coal like" (Expand Search)

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: "((\"fire and explosion danger in coal lifes\") OR (\"fire and explosion danger in coal line\"))~".
• Removing quotes may allow a broader search: (( fire and explosion danger in coal lifes ) OR ( fire and explosion danger in coal line ))~.
• Adding a wildcard symbol may retrieve word variants: (("fire and explosion danger in coal lifes") OR ("fire and explosion danger in coal line"))*.