TSQL LIKE In Reporting Service

Hi there

I've created Report Parameter called AssetCode. In quiry for database, I've created like this:

SELECT a.id1, a.deliverydate, a.retirementdate, b.organisationname, c.costcentre,a.id4,mm.hierarchydescription
FROM Asset as a (NOLOCK)
LEFT JOIN makemodel as mm (NOLOCK) ON a.makemodelid = mm.makemodelid
LEFT JOIN OrganisationTree as b (NOLOCK) ON a.physicalLocationOrgID = b.orgid
LEFT JOIN AssetChargeSplit as c (NOLOCK) ON a.assetid = c.assetid
WHERE a.status = '2'
AND a.id1 LIKE @AssetCode
AND (mm.assettype = 1 or mm.assettype = 6)
ORDER BY a.id1 ASC,
c.costcentre DESC

But when you run a report, if you put for instance "NA196" as keyword, it doesn't return the data for "NA1961", "NA19602", "NA1965", etc etc. But if you put in textfield such as "NA196%", it get the data. ?!?! So how do replace this behaviour?

Thanks