I am a fair person. I will give you all the reasons why we lost lands/island and probably our MARITIME regions also.
1. It is true that Prince Sihanouk accepted Brevie Line to determine the borderline between Cambodia and Vietnam. Brevie Line also stated that any area on the south of the line belong to Vietnam. Anything above or on the NORTH of the borderline belong to Cambodia. Therefore, according to this statement, Koh Tral belonged to Vietnam.
2. However, it is really difficult for us to claim Koh Tral back because if we can claim Koh Tral back, we also can claim Kampuchea Krom. I say it is "difficult" because of the Brevie Line, but it might be possible if we go to International Court of Justice.
3. According to the Paris Peace Agreements in 1991, we can reject all the maps/treaties signed/agreed illegally by Prime Minister Hun Sen between 1979-1992 because of those maps/treaties signed by Hun Sen, Vietnam can to take our maritime area nearby Koh Tral (Phu Qouc).
4. In 2005, Hun Sen also signed/agreed that our maritime areas near Koh Tral belong to Vietnam by using the illegal treaties. However, we can claim those maritime areas back by using the Paris Peace Agreements.
Therefore, the possibility of reclaiming Koh Tral back is about 25% and the possibility to get our maritime areas is about 80%.
This guy Hun Sen has tried to manipulate us by using Prince Sihanouk as a main condemnation/scapegoat over his real mistakes.
Now, let's see how Prime Minister Hun Sen solves this issue. If he can claim Maritime the areas a the nearby Koh Tral, I will support him. If not, he is a traitor.
I hope all Cambodian people will wake up and see how he solves the maritime issue.