The following bug has been logged online:

Bug reference: 1401
Logged by: Sirilug
Email address: fatcat_kay@yahoo.com
PostgreSQL version: from linux 9.0
Operating system: linux 9.0
Description: Thai language
Details:

1. can not sort thai language on ก-ฮ
2. when input thai language 2 words for 2 records and search by use sql as:
input 'กกก' and 'ขขข' to text1 field then use sql=select * from
tables where text1='กกก', the result show 2 records are 'กกก'
and 'ขขข'

If above bug can solve, hope you to send mail to me for advise..

Regards
Kay

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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match