'Search' in the Bible

Because the Gentiles go in search of all these things: for your Father in heaven has knowledge that you have need of all these things:

And into whatever town or small place you go, make search there for someone who is respected, and make his house your resting-place till you go away.

What would you say now? if a man has a hundred sheep, and one of them has gone wandering away, will he not let the ninety-nine be, and go to the mountains in search of the wandering one?