To work around this, just hit the shortcut + , (or File >> preferences >> settings ) and add the following line to the configuration:
"search.useIgnoreFiles": false
This solved the problem.
It's important to remember that you do not always want to search in some folders. To skip specific folders, use the following line in the configuration:
"search.useIgnoreFiles": {
"./node_modules" : true
}
Remember that if you want to use this setting specifically for just one project, edit it in "Workspace Setting" instead of "User Settings".