Kono kagi wa chiisai node, nakushita toki ni mitsukenikui desu.

This key is small, so it is hard to find when you lose it.

Ano resutoran no iriguchi wa rojiura ni aru node, mitsukenikui.

The entrance to that restaurant is in a back alley, so it's hard to find.

Jibun no bunshō no machigai wa, jibun de wa mitsukenikui mono desu.

It is hard to find mistakes in your own writing by yourself.

Yotsuba no kurōbā wa mezurashii node, totemo mitsukenikui.

Four-leaf clovers are rare, so they are very hard to find.

Pasokon no desukutoppu ni fairu ga oosugite, hitsuyōna mono ga mitsukenikui.

There are too many files on my computer desktop, making it hard to find what I need.

Hitodebusoku no ima, yūshūna jinzai o mitsukenikui jōkyō ni natte imasu.

With the current labor shortage, it has become difficult to find talented personnel.