Ploblems sound English in thai,often found to compare the sounds that do not match,and the use of similar sound instead.
Because Thailand has no language to pronounce consonants to particular.
Ex. Th no in thai,so use rather simila.with pronunciation...
V compare the sound ... Etc.
Other from this may be due to other caises from environment,pronunciation wrong and did not correct them.
Therefore,the pronunciation changed compared to native speakers of English.