The question How to easy search (using tags) - using * ? has already shown a way how to use asterisks (*) with tags for better search.
But assuming an example of "Is there a way how to search for really ALL questions concerning e.g. ArcGIS" when they do not have a tag [arcgis-desktop] and
- you do not want to search for all tags that are connected with AcGIS and them type them all manually using "or" in between and
- do not want to use (only) [arcgis*] or [arc*] because it just do not cover them all - see tags like [modelbuilder] that do not contain "arc" or "arcgis" in the name of the tag but are surely connected with ArcGIS
is there some different/better/faster way?
There has been some questions about grouping tags or making hierarchies on main meta (like Can we group, constrain and add heirarchy to tags? or New special group of tags for StackOverflow) as well as a number of "favourite tags" issues which goes to something else. The two first mentioned look not to be popular enough nor received without doubts. And also there are more views how to (not) use them.
E.g. groupping tags that are connected with certain software would surely be a one solution for this.