two similar match/search functions, only one works

Hello,

I have two functions:

Function A:
={MATCH($AD$51 & 1,('AMUSA PRICING'!$D$165:$D$1159) & (--NOT(NOT(SEARCH($AD$50,'AMUSA PRICING'!$L$165:$L$1159)))),0)+164}

Function B:
={MATCH($AD$51 & 1,('AMUSA PRICING'!$D$165:$D$1159) & (--NOT(NOT(SEARCH($AD$52,'AMUSA PRICING'!$M$165:$M$1159)))),0)+164}

Only Function B returns an answer; I get a #N/A for Function A.

I have tested out the following functions and they return answers with no errors:

={MATCH(1,(--NOT(NOT(SEARCH($AD$50,'AMUSA PRICING'!$L$165:$L$1159)))),0)+164}
={MATCH($AD$51,'AMUSA PRICING'!$D$165:$D$1159,0)+164}
={MATCH(1,(--NOT(NOT(SEARCH($AD$52,'AMUSA PRICING'!M165:M1159)))),0)+164}

Any thoughts as to what might be causing this issue?

What I am trying to do is combine a matching function with a searching function, which I seem to be able to do for Function B, but not Function A. The "D" column is for a horsepower value (always a whole number) so I can control entry via data validation. The "M" column contains data listing out different voltages with things like "208/460V" in a cell, so I want to be able to search "208" or "460" and return the same cell each time. Similarly, for the "L" column I have data that's a mixture of five different unique entries, but two entries contain similar terms and both should appear if the proper search term is entered (e.g. I search "V-Belt" and I get values from "V-belt" and "V-belt for special use"). I am able to edit everything, so if changing the way I am setting up my data columns is required instead of the formulas I can do that as well.

Ultimately I'd like to be able to take some input values for HP (Column D), Voltage (Column M), and Drive Type (Column L) and come up with the row that fits all the criteria using a formula.