。
I couldn't find my bag anywhere.
Literal
I [of-の] bag [topic-は] nowhere couldn't-find.
見当たる ('to be found, to come in sight') is the intransitive counterpart of 見つける ('to find'). Its negative 見当たらない = 'not to be found.' どこにも + negative = 'nowhere.' A typical search-is-hopeless formulation.