Perhaps you should try some spelling variations:
"electric multiple unit" » "electrica multiple unit", "electricos multiple unit", "electronic multiple unit", "electric multiples unit"
"electrico multiple unit" » "electricao multiple unit", "electricoso multiple unit", "electronico multiple unit", "electrico multiples unit"
"electronica multiple unit" » "electronica multiples 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 multiple unit\"))) OR (\"electronica multiple unit\"))~".
• Removing quotes may allow a broader search: (((( electric multiple unit ) OR ( electrico multiple unit ))) OR ( electronica multiple unit ))~.
• Adding a wildcard symbol may retrieve word variants: (((("electric multiple unit") OR ("electrico multiple unit"))) OR ("electronica multiple unit"))*.