The spellings of Asian keywords (proper names as well as technical terms) can vary because there are different ways of transliterating them 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.
