This is the 17832nd most frequent Polish word.
złodziei
"Thieves"
Here, 'złodziei' is the genitive plural form of 'złodziej' (thief) used to indicate possession or association to multiple thieves.
Złodziei złapano na gorącym uczynku.
The thieves were caught red-handed.
In this case, 'złodziei' is the accusative plural form because it is the direct object of the action 'in search of'.
Przyszedłem tutaj w poszukiwaniu złodziei.
I came here in search of thieves.
'Złodziei' appears in the genitive plural form again, as it is used with the verb phrase 'nie ma' (there is no), which calls for the genitive case.