tàn
explore, find
Phonosemantic compound. 扌 represents the meaning and 罙 represents the sound.
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Cao Wei (Three Kingdoms: 222-280 AD)Regular script
ModernDefinitions
tàn
find, locate; search, grope for; to explore; to search out; to scout; to visit; to stretch forward
Sources