I need to find only posts with a tag forest gump. I’ve tried: new WP_Query('tag=forest+gump');, new WP_Query('tag=forest gump');. However they both return ALL the posts and not only the posts with forest gump tag. Single tags (without spaces) work fine, though. Alternatives (like plain SQL) will work as well.
The entry tag line is forest gump, forrest gump, questend.
new WP_Query('tag=forrest+gump,forest+gump,questend');should work too…