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Adding zero to an expression and avoiding simplification

Hi, I have an expression of the form

pol_y = chi_yyyy*Ey*Ey*Ey + (chi_yyxx + chi_yxyx + chi_yxxy)*Ey*Ex*Ex - (chi_yyxx + chi_yxyx + chi_yxxy)*Ey*Ex*Ex + (chi_yyxx + chi_yxyx + chi_yxxy)*Ey*Ex*Ex

Now the last two terms add 0 to the expression. The goal is to substitute complicated expressions for Ey, Ex and compare the results of two different reformulations (with and without the 0 terms). So for my work, I need the last two terms to be there but sagemath is simplifying this expression automatically. How do I avoid this?

Adding zero to an expression and avoiding simplification

Hi, I have an expression of the form

pol_y = chi_yyyy*Ey*Ey*Ey + (chi_yyxx + chi_yxyx + chi_yxxy)*Ey*Ex*Ex - (chi_yyxx + chi_yxyx + chi_yxxy)*Ey*Ex*Ex + (chi_yyxx + chi_yxyx + chi_yxxy)*Ey*Ex*Ex

Now the last two terms add 0 to the expression. The goal is to substitute complicated expressions for Ey, Ex (complex quantities) and compare the results of two different reformulations (with and without the 0 terms). So for my work, I need the last two terms to be there but sagemath is simplifying this expression automatically. How do I avoid this?