needle in a haystack (idiom) - of something that is very difficult to find, like looking for a needle (เข็ม) in a haystack (กองหญ้าแห้ง)
needle in a haystack (idiom) - of something that is very difficult to find, like looking for a needle (เข็ม) in a haystack (กองหญ้าแห้ง)