“to search” in Japanese is 探, read tan, sagu, saga (たん, さぐ, さが). It is a Grade 6 Kyōiku kanji, taught in year 6 of Japanese elementary school, and appears in words such as 探偵 (detective).
What does 探 mean?
なくした鍵を探しています。
Same sound, different character — the classic trap. Compare them side by side: