String Match Number Of Different Columns

Hi,

In short:
I want my following problem to work with a LIKE instead of exact match and if possible be faster. (currently 4s)

Problem:
I got a set of rows with varchar(50), spread out over multiple tables.
All those tables relate to a central Colour table.
For each of the columns, I want to match the values with a set of strings I insert and then return a set of Colour.Id

E.g: input: 'BLACK', 'MERCEDES', '1984'
Would return colour ids "025864", 45987632", "65489" and "63249"
Because they have a colour name containing 'BLACK' or are on a car from 'MERCEDES' or are used in '1984'.

Current Situation:
I) Create a table containing all possible values
CREATE TABLE dbo.CommonSearch(
id int IDENTITY (1, 1) NOT NULL,
clr_id int,
keyWord varchar(40),
fieldType varchar(25)
And fill it with all the values (671694 rows)
)
II) Stored Procedure to cut a string up into a table:
CREATE FUNCTION dbo.SplitString
(
@param varchar(50),
@splitChar char = ''
)
RETURNS
@T TABLE (keyWord varchar(50))
AS
BEGIN
WHILE LEN( @param ) > 0 BEGIN
declare @val varchar(50)
IF CHARINDEX( @splitChar, @param ) > 0
SELECT @val = LEFT( @param, CHARINDEX( @splitChar, @param ) - 1 ) ,
@param = RIGHT( @param, LEN( @param ) - CHARINDEX( @splitChar, @param ) )
ELSE
SELECT @val = @param, @param = SPACE(0)
INSERT INTO @T values (@val)
END
RETURN
END
III)Stored Procedure to query the first table with the second one
CREATE PROCEDURE [dbo].[GetCommonSearchResultForTabDelimitedStrings]
@keyWords varchar(255) = ''
AS
BEGIN
SET NOCOUNT ON;
select clr_id, keyWord, fieldType
from dbo.commonSearch
where keyWord in (select * from splitString(@keyWords, ''))
END

So, how can I use a LIKE statement in the IN statement of the last query.
Furthermore, I was wondering if this is the best sollution to go for.
Are there any better methods? Got any tuning tips to squeeze out an extra second?