งงทำไมมันไม่เข้าเงื่อนไขทีอื่น else if ทั้งๆที่มันควรจะเข้า

if (!empty($searchStu)) { //เงื่อนไขที่ 1
					$stmtSelect = $conn->prepare ("SELECT * FROM tb_student WHERE CONCAT(student_id,student_name)  LIKE '%$searchStu%' ");
					$stmtSelect ->execute();
	//เงื่อนไข2		}elseif (!empty($searchSelBranch) && !empty($searchSelAround) && !empty($searchSelFunds) ) {
					$stmtSelect = $conn->prepare ("
						SELECT * FROM tb_student WHERE student_around  LIKE '%$searchSelAround%' 
						AND student_branch LIKE '%$searchSelBranch%' 
						AND student_funds LIKE '%$searchSelFunds%' 
						");
					$stmtSelect ->execute();
	//เงื่อนไข 3		}elseif (!empty($searchSelBranch) && !empty($searchSelAround) ) {
					$stmtSelect = $conn->prepare ("SELECT * FROM tb_student WHERE student_around  LIKE '%$searchSelAround%' AND student_branch LIKE '%$searchSelBranch%' ");
					$stmtSelect ->execute();
				}elseif (!empty($searchSelBranch)) {
					echo $searchSelBranch;
					$stmtSelect = $conn->prepare ("SELECT * FROM tb_student WHERE student_branch LIKE '%$searchSelBranch%' ");
					$stmtSelect ->execute();
				}else {
					$stmtSelect = $conn->prepare ('SELECT * FROM tb_student');
					$stmtSelect ->execute();		
				}