If you know keywords in the software name that you do/don't want, you could set up something like this:
SELECT Top 1000000
tblAssets.AssetID,
tblAssets.AssetName,
tsysAssetTypes.AssetTypename,
tsysAssetTypes.AssetTypeIcon10 As icon,
tblAssets.IPAddress,
tblAssets.Lastseen,
tblAssets.Lasttried,
tblSoftwareUni.softwareName
FROM
tblAssets
Inner Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
Inner Join tsysAssetTypes On tsysAssetTypes.AssetType = tblAssets.Assettype
Inner Join tblSoftware On tblAssets.AssetID = tblSoftware.AssetID
Inner Join tblSoftwareUni On tblSoftwareUni.SoftID = tblSoftware.softID
WHERE
tblAssetCustom.State = 1
AND tblSoftwareUni.softwareName LIKE 'Microsoft SQL Server%'
AND ( tblSoftwareUni.softwareName LIKE '%2000%'
OR tblSoftwareUni.softwareName LIKE '%2005%'
OR tblSoftwareUni.softwareName LIKE '%Compact%'
)
AND tblSoftwareUni.softwareName NOT LIKE '%Backward compatibility'
AND tblSoftwareUni.softwareName NOT LIKE '%Books Online%'
AND tblSoftwareUni.softwareName NOT LIKE '%Query Tools%'
ORDER BY
tblSoftwareUni.softwareName,
tblAssets.AssetName
That should produce a list of all Microsoft SQL Server 2000, 2005 or Compact editions while excluding references to Backward compatibility, Books Online or Query Tools (all results that showed up in my inventory when I was trying this out).
If you're less certain of what's in your inventory, you might prefer to just build an exclusion list, though it can get a little cumbersome. e.g.
WHERE
tblAssetCustom.State = 1
AND tblSoftwareUni.softwareName LIKE 'Microsoft SQL Server%'
AND tblSoftwareUni.softwareName NOT LIKE '%App Framework'
AND tblSoftwareUni.softwareName NOT LIKE '%Backward compatibility'
AND tblSoftwareUni.softwareName NOT LIKE '%Books Online%'
AND tblSoftwareUni.softwareName NOT LIKE '%Command Line Utilities'
AND tblSoftwareUni.softwareName NOT LIKE '%Compiler Service'
AND tblSoftwareUni.softwareName NOT LIKE '%Data Tools%'
AND tblSoftwareUni.softwareName NOT LIKE '%Language Service'
AND tblSoftwareUni.softwareName NOT LIKE '%Management Objects%'
AND tblSoftwareUni.softwareName NOT LIKE '%Management Studio%'
AND tblSoftwareUni.softwareName NOT LIKE '%Native Client'
AND tblSoftwareUni.softwareName NOT LIKE '%Policies'
AND tblSoftwareUni.softwareName NOT LIKE '%Query Tools%'
AND tblSoftwareUni.softwareName NOT LIKE '%Report Builder%'
AND tblSoftwareUni.softwareName NOT LIKE '%ScriptDom'
AND tblSoftwareUni.softwareName NOT LIKE '%Server Browser'
AND tblSoftwareUni.softwareName NOT LIKE '%Setup%'
AND tblSoftwareUni.softwareName NOT LIKE '%Support Files'
AND tblSoftwareUni.softwareName NOT LIKE '%System CLR Types%'
AND tblSoftwareUni.softwareName NOT LIKE '%Upgrade Advisor'
AND tblSoftwareUni.softwareName NOT LIKE '%VSS Writer'
AND tblSoftwareUni.softwareName NOT LIKE 'Hotfix%'
AND tblSoftwareUni.softwareName NOT LIKE '%2008%'
AND tblSoftwareUni.softwareName NOT LIKE '%2012%'