Do you mean all constructors for a given class? All constructors for a class and all of the classes derived from it? Or actually all constructors of all types?
Also you you mean the declarations, or all calls as well?
Unfortunately this isn't something VA is designed to help you find. I don't think the IDE is designed to do this either.
If you can assume these are single line strings, I would start by doing a regular expression search for all string literals wrapped in round brackets. Using a regular expression will let you filter out certain types of false positive.