Why not "Moje ženu potřebuju."?
Must be the accusative case "moji, svou, svoji".
What is the different between svou ženu potřebuju and ¨ mou ženu potřebuju¨
It is more natural to use the reflexive pronouns where possible.
Szou is both "my" and "her", I do I know if it is "I need my wife" or "I need her wife"? "Svou zenu potrebuju"
Svůj relates to the doer or originator of the action, so usually the subject of the clause,