O Quan, also referred to as food box office or agency is a folk game of children Kinh, Vietnam. This is a game with tactical nature usually for two or three players and can use a variety of materials, easy to prepare for the game.

► Table games: table games O Quan guys on one side by relatively flat, flexible size as long as can be divided into a sufficient number of cells needed to accommodate troops and not too large to facilitate troop movements, so it can be created on the ground, sidewalk, on a flat piece of wood .... Tables were guys playing into a rectangle and divide it into ten rectangular boxes, each box has five symmetrically . In the shorter sides of the rectangle, who both box semicircle or arc outward. The square box called the People box also two cells semicircle or arc called box office.
► Military games: two types of agencies and citizens, are made or collected from a variety of materials with stable shape, size is just right for the player can hold, held by a hand more pieces to play. Relevant population size significantly larger distinctive together. Force can play as stones, bricks, stones, seeds of some fruits ... or industrial production from hard material which is common plastic. Number 2 was always concerned with the number of people depending on the rules of the game but the most common is 50.
► Army Arrangement play: two box offices are located in a semicircle or bow, each one army, the people are arranged in the squares with a military uniform, each 5 people. Where unwilling or unable searches are relevant, they may instead concerned by setting the number of people converted in the box office.
► Players: usually consists of two players, each person sitting outside the longer side of the rectangle and square side under the control of the players sitting there.
► The objective should be achieved to win: the winner of this game was when the game ended with a total population of more converted. Depending on local rules or agreement ever between two players, but popular opinion is one denominated 10 people or 5 people (flag).
► The game ends when all the ponds were eaten or been eaten gravel side of the pond that is no longer enough in stock to distribute.

Game results are used to assess the level of the player through charts "America's table" and achievements respectively: "Born map, the direction of Vice Table,