Checking Multiple Column Value

I'm trying to get col1 values for certain multiple col2 values. For example: I want to see col1 values for col2's "1, 2, 3, 4" values (that is "1" in col1). Another ex: col1 values for col2's "1, 2" are "1, 2". How can i manage to do this in SQL syntax?

What you want is called relational division. There are several ways to accomplish it. Check this question which has more than ten different solutions for a similar problem - including benchmarks: How to filter SQL results in a has-many-through relation

Here's one of the ways (it assumes that (col1, col2) combination is Unique):

SELECT col1 
FROM tableX 
WHERE col2 IN (1, 2, 3, 4)
GROUP BY col1
HAVING COUNT(*) = 4            --- the size of the above list

and another:

SELECT t1.col1 
FROM tableX AS t1
  JOIN
     tableX AS t2
         ON  t2.col1 = t1.col1
         AND t2.col2 = 2
  JOIN
     tableX AS t3
         ON  t3.col1 = t1.col1
         AND t3.col2 = 3
  JOIN
     tableX AS t4
         ON  t4.col1 = t1.col1
         AND t4.col2 = 4
WHERE t1.col2 = 1