除o左多謝，我都冇說話可以講喇! o既英文係咪 I can say nothing besides thank you?

Yes. this this the appropriate translation from chinese to english

I can say nothing besides thankyou, this is a very formal sentence if you thank sb, it means you realy thank him. usually is said by adult.

you may also say, I can say nothing than thankyou or, I can say nothing but thankyou or, There's so much to say but that's nothing better than thankyou.

hope i can help you

can also say" I have nothing else to say but thank you/"

可以!
但你也可以說：I cannot express my thanks to you in words.