[Help]Weird problem with LIKE...OR search

When I submit just one term to the search system, the search condition 'aprovar' = '1' is ignored. But when I submit two or more words,
this same condition is respected. . Take a look at my code and see if you find any error, please!
I put an echo before mysql runs, and I got:
select id,Nombre,Imagen,Visitas,Votantes,Puntos,Categoria,Thumb from neww WHERE Aprobar = '1' and Nombre LIKE '%word%' OR Categoria LIKE '%word%' OR Descripcion LIKE '%word%' OR Etiquetas LIKE '%word%' order by Visitas desc limit 0,32

It should work and show only results with Aprobar='1', but it show also results with Aprobar='0' !!

Please, help me! Thanks

function Ordenar_Columna_LIKE(){

	if(count($this->Listado) == 0){
	$this->Seleccion_Campos = "WHERE Aprovar = '1' and ";
	}
	else {
	    $this->Selecao_Campos = "WHERE Aprovar = '1' and ";
	foreach($this->Listado as $valor){
            $this->Selecao_Campos .= $valor." LIKE '%" .  $this->Ablucion($this->Busqueda)  . "%' OR ";
	}
}

return substr($this->Selecao_Campos,0,-4);


 
function Consulta_LIKE(){

	if(!eregi("^[0-9]+$",$this->MostrarResultados)) { $this->MostrarResultados = '10'; }

$this->Consulta  = "select " .  $this->Selecao  . " from " .  $this->TabeladeBusca . " ";
$this->Consulta .= "" .  $this->Ordenar_Columna_LIKE()  . " ";
$this->Consulta .= " order by Visitas desc limit " . $this->PaginaInicial() . ","  . $this->MostrarResultados .  ""; 

return($this->Consulta);

PHP:

 

try
Aprobar = '1' and (Nombre LIKE '%word%' OR Categoria LIKE '%word%' OR Descripcion LIKE '%word%' OR Etiquetas LIKE '%word%')

 

+1 for nice use of giant parentheses.