The word(s) "subtleties" appears 4 time(s) in 4 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) Vision comprehends Him not, and He comprehends (all) vision; and He is the Knower of subtleties, the Aware.

(2) O my son! surely if it is the very weight of the grain of a mustard-seed, even though it is in (the heart of) rock, or (high above) in the heaven or (deep down) in the earth, Allah will bring it (to light); surely Allah is Knower of subtleties, Aware;

(3) And keep to mind what is recited in your houses of the communications of Allah and the wisdom; surely Allah is Knower of subtleties, Aware.

(4) Does He not know, Who created? And He is the Knower of the subtleties, the Aware.