Optimizing a SQL query for SQL Server 2012 - tsql

Question

I have a database with 8 tables out of which I need to be able to search for a specific value in 6 of them.
The query, in short, should do something like this:
SELECT i.InActivity,
i.ReceivedTime,
i.ReceivedFrom,
i.DataSize,
o.FileName,
o.FileSize,
o.Status,
s1.UniqueReference,
s1.SenderCode,
s1.ReceiverCode,
s2.DetailId,
s3.UnitDescription,
t1.SenderCode,
t1.ReceiverCode,
t2.TaskDescription,
t3.TaskStatus
FROM InData i
LEFT JOIN OutData o WITH(NOLOCK) ON i.ActivityID = o.InActivity
LEFT JOIN SupplyDataLevel1 s1 WITH(NOLOCK) ON s1.InActivity = i.ActivityID
LEFT JOIN SupplyDataLevel2 s2 WITH(NOLOCK) ON s2.ParentId = s1.ActivityID
LEFT JOIN SupplyDataLevel3 s3 WITH(NOLOCK) ON s3.ParentId = s2.ActivityID
LEFT JOIN TasksDataLevel1 t1 WITH(NOLOCK) ON t1.InActivity = i.ActivityID
LEFT JOIN TasksDataLevel2 t2 WITH(NOLOCK) ON t2.ParentId = t1.ActivityID
LEFT JOIN TasksDataLevel3 t3 WITH(NOLOCK) ON t3.ParentId = t2.ActivityID
WHERE s1.IdSender = #searchParam OR
s1.IdReceiver = #searchParam OR
s2.StackNumber = #searchParam OR
s2.StackOrderNumber = #searchParam OR
s3.Reference = #searchParam OR
t1.ProcessReference = #searchParam OR
t1.ProcessStage = #searchParam OR
t1.MasterNumber = #searchParam OR
t2.ProcessStep = #searchParam OR
t3.SubProcessStep = #searchParam
So question is, there has to be a better way than this. The tables contains millions of rows and executing this query will, no doubt, take hours and hours to execute, which rhymes badly with the web site which will have the search page.
Should I create a view and query that one, would that be a better alternative, performance wise?
Any help is welcome.