Some time you can't type khmer unicode in adobe photoshop right? now no problems just follow the following step.
Step 1 for adobe photoshop cs 5 or older version.
first of all you have to download the fonts simply just click here to download and then right click extract. you will see all file display like bellow.
Select all file and right click => Install
Or simply you can copy all font and go to C:\Windows\Fonts and past there...
After you follow above open your photoshop then select on font you are installed (kh ---) and switched Key board to KH or Catalan. See image below.

If you are using Adobe photoshop CS6 it is more easily.

Just Click on Edit => Preference => Type
Then Check on Middle Eastern => OK it is finish.

Sihanoukville (Krong Preah Sihanouk) it is also known as Kampong Saom, is a province of Cambodia close to the sea in south earth of Cambodia, it is far from Phnom penh about 247 km, it can take about 3h 30min to 3h 50min on national road 4 or national road 3 by bus. it is a growing city of economic with a deep port far from the city about 20 km and the most beautiful beach and island  in Cambodia with many tourism from difference destination all over the world come to visit and stay for tourist. especially in the high season.

Please see the maps
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THE HISTORY OF THE ANGKOR WAT TEMPLES Angkor translates to mean 'Capital City' or 'Holy City'. The ruins of this holy city are the remnants of the Angkorian capitals and represent the pinnacle of the ancient Khmer architecture, art and civilization. The Angkor Wat temples were built between 800AD to 1300AD. During this time over 27 kings ruled this large territory, about 400 Square kilometers (250 square miles) in north western Cambodia. The temples are thought to have been abandoned around the 15th century. They were built by the Khmer Empire which was one of the greatest powers in South-East Asia. The 'Khmer' refers to the dominant ethnic group in modern and ancient Cambodia. It is estimated that at its height of rule the population contained more than one million people. The temples are not only impressive because of the beauty. It is also amazing to marvel at the vast waterworks and military defenses that were put in place. They were quite advanced for their time.