If you made a mess reset to all unit types will fix it. ;)
W and STR are the same for this filter.
The filter for the MOV attribute works like the unit type filter.
The tags entered are parsed by an regular expression, so partial strings are found too. Enter shotgun to find all shotguns, regardless of which specific type. You can use regular expression syntax to refine your search, e.g. Martial Arts L would find units with either L2 or L3 - the square bracket mean one of these characters.
Martial Arts L
It is useful to know that ^something will look for strings beginning with something and something$ will find string ending with something. So ^Hacking Device$ should give you all basic Hacking Device entries, but non other.
If you want to send this search result to someone or post in a forum the share this result button at the top of the search result will give you a link that will lead to exactly the search you specified.