Vlookup- Closest match that contains the exact lookup value?

[Muthanna]

I need your help.
i'm trying to to look up the exact value of a variable or the closest match
that contains the exact value.
for exampel,
if i try to lookup 1234 in table that includes ABD1234, i want to get ABD1234.
rigt now the TRUE function give the closest numerical # to 1234 not the cell
that contains 1234. Therefore, if i have in the table of array 1234.5 i will
get this approximate vlaue instead of the desired ABD1234.

any one can help me with this?!