查找 (cházhǎo) is a formal, written word for 'to search for, to look up' — it combines 查 (check) and 找 (look for). It's more formal than 查 (chá, HSK3), which is the everyday word for looking up a word or checking information, and broader than 搜索 (sōusuǒ, HSK5), which is specifically for systematic searching (e.g., on the internet). 搜 (sōu, HSK5) is more colloquial and often used for physical searches.