SQL & PL/SQL :: Get List Of Vendors Based On Country And Campaign?

I want to get a list of vendors based on country and campaign.I first get all vendors based on country then i subtract the vendors i shouldn´t see (the vendors i should not see minus those i should see).Below you see my query - is there a better way to get the same result?

3 tables
vendor - vendorInformation
vendorcountry_spec - A vendor can be located in different countries with different information.
vendorcountry_campaign - In a country there are different campaigns. If there is a row in this table, only those with the campaignID should see the vendor else everyone in that country.

The query:

SELECT v.vendorID
FROM vendor v, vendorcountry_spec vs
WHERE v.VENDORID = vs.VENDORID AND v.status = 'A'
AND vs.STATUS = 'A' AND vs.ISCORPORATE = 1
AND v.ISNOTHIGHLIGHTED = -1 AND vs.COUNTRYCODE = 'SE'
GROUP BY v.sortNr, v.vendorID

[code]....