Few and far between is a static phrase we use to say 'very rare', so you're lucky you found them. You can google the term. Collins dictionary says: Things that are few and far between are very rare or do not happen very often. [emphasis] Visitors to the town were few and far between. Synonyms: scarce, rare, unusual, scattered More Synonyms of few and far between.

Hello Huy, "few and far between" is used to describe something that does happen very often.

People who are both smart and pretty are few and far between. Good tutors are few and far between. Excellent Indian restaurants in Taiwan are few and far between. Basically, there aren't many.