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Acknowledgement
First of all, I would like to express my deepest gratitude to Assoc. Prof. Nguyen
Duy Tan was willing to supervise me despite my impoverished undergraduate mathe-
matical background. Thanks to his topic suggestion and his supervision, I have learnt
so many things about Galois cohomology in particular and mathematics in general.
His guidance helped me all the time of writing this thesis. I could not have imagined
having a better supervisor for my MSc study.
Secondly, I would like to thank my lecturers, especially Dr. Nguyen Dang Hop
and Dr. Nguyen Chu Gia Vuong, for many valuable mathematical lessons and in-
sights. I would like also to thank the Graduate University of Science and Technology
and the Institute of Mathematics for providing a fertile mathematical environment.
Special thanks goes to Nguyen Van Quyet and Quan Thi Hoai Thu who all helped me
in numerous ways during my study in Hanoi. To Quyet in particular I owe you one for
being a supportive friend as well as keeping me feel accompanied and conversations
on various issues besides mathematics during my leisure times.
I would like also to thank my girlfriend Pham Thi Minh Tam, who has been by
my side throughout my MSc, for all her love and support.
Last but not least, my thanks goes to my parents and siblings for always believing
in me and encouraging me to follow my dreams.