The spellings of Asian city and personal names can vary because there are different ways of rendering names originally in Asian language characters (Chinese, Korean, Sanskrit, etc.) into English. This process is called Romanization. An example is the name of China's capital city, which used to be rendered "Peking" but is now rendered "Beijing."
Databases will often have a preferred Romanization, which can be found in the database's thesaurus. Often, the preferred Romanization will give you all the articles in the database, but if you see other Romanizations in your results list, try searching for them as well.