actually meaning depends on the situation for example. imagine you are trying a pair of shoes in a shoe store you tried the left one but you can not see the other right single around. in this situation you can tell the seller that " bunun eÅŸi yok" here that means I can not find the other one.
another example: you are in an art gallery and you see a unique picture by picasso. and there is nothing like it in the world.then you can say "bunun eÅŸi yok". that means that it is unique.