You can use Evaluate formula na try to follow steps:

First take (for example) a string Faktura Fra Mona Mona lug 123 and use word from 4th place after FRA (SEARCH("Fra ";A3&"Fra ")+4) onwards (255)
  • MID(A3;SEARCH("Fra ";A3&"Fra ")+4;255)
  • MID(Faktura Fra Mona Mona lug 123;SEARCH("Fra ";Faktura Fra Mona Mona lug 123&"Fra ")+4;255)
  • MID(Faktura Fra Mona Mona lug 123;13;255)
  • Mona Mona lug 123

Now replace SECOND space with 255 spaces to get huge gape between second and third word
  • SUBSTITUTE(MID(A3;SEARCH("Fra ";A3&"Fra ")+4;255);" ";REPT(" ";255);2)
  • SUBSTITUTE(Mona Mona lug 123;" ";REPT(" ";255);2)
  • Mona Mona_______________spaces_________lug 123

Now take left 100 characters (it should be enough for two words but won't take thirw word which is 255 chars away. You can change those 100 to 200 for example if first two words are longer.
  • LEFT(Mona Mona_______________spaces_________lug 123;100)
  • Mona Mona_______________spaces


And TRIM function will remove those extra spaces
  • TRIM(Mona Mona_______________spaces)


leaving just
  • Mona Mona

Hope it's clear.