This is the 15076th most frequent Russian word.
поисках
"In search."
The word 'поисках' here is used to indicate the action of searching for something, serving a contextual purpose to describe the quest for adventures.
Мы отправились в поисках новых приключений.
We set out in search of new adventures.
Here, 'поисках' emphasizes the continuous and purposeful activity of seeking or searching for something over time, in this case, truth.
Он был в поисках истины в протяжении всей своей жизни.
He was searching for the truth throughout his life.
In this context, 'поисках' ties into a metaphorical search for emotional or intangible concepts such as happiness.