Column results not showing up in Multiterm database search

Hello. I am trying to structure a database containing a lot of acronyms so that they show up in a database search. 

Eample, I have 4 columns, with source and target acronyms and their meanings:

Col1        Col2                             Col3       Col4

DDSE----dose dérivé sans effet----DNEL----derived no-level effect

Columns 2 + 4 (entry level) and column 3 (term level) are showing up, but column 1 (term level) is not.

What can I do to achieve this? Many thanks.