The spies who went to "tur" the promised land (Numbers 13-14) represent two very different theological responses to what they found: ten saw only giants, two (Joshua and Caleb) saw the land through the lens of God's promise. The same act of searching produces entirely different conclusions depending on one's faith. Tur is also used in Ecclesiastes 1:13 of Qoheleth's exploration of wisdom "under the sun" — a thorough but bounded search that ultimately points to God.
Tur means to go about searching, to explore or spy out a land, to survey possibilities. The twelve spies sent into Canaan were told to "tur" the land (Numbers 13:2) — a careful reconnaissance mission. It also describes the searching of one's own heart.