Welcome Hai Dang....your English is very good sir!

Your question is a very good one. I'm interested in hearing an answer from some of the aero professionals that frequent this forum. I've had the opinion that a wing with a thicker tip airfoil percentage would reduce tip stalling tendencies and have aerodynamic washout but I've seen various internet responses to this question from gentlemen with much aero engineering expertise say this isn't necessarily true. I think it has more to do with the zero-lift angle of attack of the chosen root & tip airfoils.

Along with you, I am awaiting a learned response to your question.