Perhaps you should try some spelling variations:
"electric multiple unit" » "electrica multiple unit", "electricos multiple unit", "electronic multiple unit"
"electrico multiples unit" » "electricao multiples unit", "electricoso multiples unit", "electronico multiples unit"
"electricosa multiple unit" » "electricaosa multiple unit", "electricososa multiple unit", "electronicosa multiple unit"

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: "((((\"electric multiple unit\") OR (\"electrico multiples unit\"))) OR (\"electricosa multiple unit\"))~".
• Removing quotes may allow a broader search: (((( electric multiple unit ) OR ( electrico multiples unit ))) OR ( electricosa multiple unit ))~.
• Adding a wildcard symbol may retrieve word variants: (((("electric multiple unit") OR ("electrico multiples unit"))) OR ("electricosa multiple unit"))*.