expression
in search of; in order to look for
Used as a purpose expression with verbs of motion, such as 行く or 来る, to indicate going somewhere to look for something.
彼は仕事を探しに東京へ行った。
He went to Tokyo in search of a job.
私は本を探しに図書館に来ました。
I came to the library to look for a book.