which pen brand is the nicest? ( Hong Ha/ Thien Long/ Campus....) 

I think pen brand of Thien Long is the nicest.

#NOCOPY

I can tell you its Campus! In Japan, Campus is the leading notebook brand, occupying almost the entire domestic market with 95% of students using it when going to school. It is one of the main products of Kokuyo - the leading stationery and school supplies corporation in Japan. In Vietnam, Campus hopes to help you unleash your learning, creativity and fun every day.

Moves to the pen, here is why I love campus pen :As long as you write the keyword with an orange pen then use the red film to cover the area to memorize, the orange ink will completely disappear, allowing you to check exactly what you need to remember. Interesting and simple, right? If you combine the Memorization Kits with Flashcard into your learning, your notes and learning will be even more effective.