You have to take into account that you are creating two-dimensional arrangements, so to store values in them, you have to indicate the positions where you will store them.
nombre[5][10]
nombre
is a bi-dimensional array of 5 rows and 10 columns, if you want to store a value in that array you have to indicate the position of the row and the column where the value will be stored.
nombre[2][5] = nombre_buscado;
In this case, the value of the variable nombre_buscando
will be stored in row 3 and column 4. In the arrangements the positions start counting from zero. If you have a 3-position arrangement, the positions will be: 0, 1 and 2.