Bug/Issue Map browser / filter button doesn't show all results

If you go to "Custom Content" > "Share" > "Browse" tag > "Filter" button and search for various expressions in the "Title:" field many things do not show up that technically should.

For example, there are many maps with "co-op", "AI", "A.I.", "vs." and many similar expressions in the title but if you search for those terms/symbols you get zero hits.