我々は埋められた宝をさがしていた。

we

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

to bury (e.g. in the ground); to fill up (e.g. audience fills a hall); to cause to be packed; to plug (a gap); to stop (a gap); to bridge (a difference, a gap); to fill (a seat, a vacant position); to fill out; to make up for (a loss, shortage, etc.); to make amends; to compensate for; to put cold water (in a bath); to cover; to scatter something over

treasure

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to search (for something desired, needed); to look for; to search (for something lost); to seek (a suspect in a crime)