Null, Empty, Blank still giving values

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I am trying to select only the values that are NULL or where there are no values.

Where IsNull(value1, '') = '' 

I Also did it like this

Where value1 IS NULL OR value1 = '' 

however I do get NULls and empty but I keep getting like 4 values that are not empty they have values in it. Is there another way to do it

SELECT * FROM table1 WHERE value1 IS NULL OR value1 = '' 

I get

value1 value2
NULL 3
5
NULL 76
9
3
12 12
14 6
8
NULL 3
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