It works, but the formula size grows significantly when you add new conditions. Moreover, it is hard to debug. ISNUMBER returns TRUE/FALSE, no need to add "=TRUE".
Presonally I would combine SEARCH results in single OR formula, without nested IFs, esp. due to common output ($K6 or ""):
[tt]=IF(OR(ISNUMBER(SEARCH("Desktop Simulator",$J6)),ISNUMBER(SEARCH("LOS",$J6))),$K6,"")[/tt]
New condition is simple in this case:
[tt]=IF(OR(ISNUMBER(SEARCH("Desktop Simulator",$J6)),ISNUMBER(SEARCH("LOS",$J6)),ISNUMBER(SEARCH("DTS",$J6))),$K6,"")[/tt]
combo