Perhaps you should try some spelling variations:
"ac converter" » "dc converter", "a converter", "dc converters", "adc converter", "a_ converter", "aa converter"
"lc converter" » "lcc converter", "llc converter", "dc converter", "ldc converter", "l_ converter", "la converter"
"c converter" » "dc converter", "_ converter", "a converter"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("c converter") OR ("ac converter"))) OR ("lc converter")).
• Removing quotes may allow a broader search: (((( c converter ) or ( ac converter ))) or ( lc converter )).
• Adding a wildcard symbol may retrieve word variants: (((("c converter") or ("ac converter"))) or ("lc converter"))*.