أجد means I found.. and the other word we spell it like this: "أبحث" and it means i search or seek.. we can use them in those two sentences: "لم أجد حذائي" means I didn't find my shoes. "أنا أبحث عن كتابي" I'm searching for my book.

بحثت عن كتابي ووجدته I searched for my book then I found it