Help Needed: Dendrobium Identification

[Gofa]

Good day everyone. A good friend of mine gave me pots of orchids last December as a Christmas and birthday gift. I was really touched by his thoughtfulness and promised that I will do my best to take care of them. Since then, my interest in orchids started to grow. I think Im doing fairly well in terms of maintaining them (they're all still alive ) but I wasnt successful finding their names-- just when I thought I found the right name, here appears the same flower but with another name.

Ive attached pics which were taken when they were all still in bloom. Would really appreciate all your feedback and expertise.