Hello,
Can anyone tell me that how you check vocabulary and grammar for your thesis? Do you use any software? I have use some online free grammar checkers. But they are not good enough. Therefore, I was wondering how do other people check their vocabulary and grammar for their thesis while English is their second language. Much appreciated.

From a specific ESL perspective, I can't give much advice; however, I've always found David Crystal to be a valuable companion when it comes to all things English Language.

First book on grammar of his that I came across on a search linked below.
He's a very prolific author, and there are a good number of his works that you might find useful.

In terms of vocabulary, I'd recommend a good thesaurus.

In general, I would always be extremely wary of an electronic 'grammar checker'; as you rightly say, they are not good enough.

All Best.