https://www.google.fr/search?q=2+ngu%E1%BB%93n+s%C3%B3ng+gi%E1%BB%91ng+r+s%C3%B3ng+gi%E1%BB%91ng+nhau+a,b+c%C3%A1ch+nhau+10cm+c%C3%B3+ph%C6%B0%C6%A1ng+tr%C3%ACnh+u%3D4c%C3%B3+junt+t%E1%BB%91c+%C4%91%E1%BB%99+truy%E1%BB%81n+somg+l%C3%A0+10cm+tr%C3%AAn+gi%C3%A2y+%C4%91i%E1%BB%83m+m+thu%E1%BB%99c+%C4%91o%E1%BA%A1n+ab+v%C3%A0+c%C3%A1ch+a+3cm+gi%E1%BB%AFa+m+v%C3%A0+o+c%C3%B3+m%E1%BA%A5y+%C4%91i%E1%BB%83m+giao+%C4%91%E1%BB%99ng+v%E1%BB%9Bi+bi%C3%AAn+%C4%91%E1%BB%99+8cm&client=safari&hl=vi&prmd=vinx&source=lnms&sa=X&ved=0ahUKEwiwj_aJ093zAhVCL6YKHQ_AUIEygA&biw=414&bih=622&dpr=3#ip=1
