Try going to http://google.com/m/preferences from your phone. This page should let you change Google's language settings.

Thank you very much, this helps but the problem is that the page coming up is all in Thai only and there are no English characters present to know what you set. At least the button to set the language to English should be labeled in this language as well as the button apply. Alternative is to use both languages as a person wanting to change the settings must be able to understand at least one of the two languages.