I'm using VIM7.4.488 on ubuntu 15.04 system. I use command
:setlocal spell spelllang=en_us for spell checking.
It can capture some spelling error as well as words like
iffalse. However, it did not detect the error spelling
tehrmal (thermal). Then I tried
ge agw obr tbg., and type the command again, the obvious incorrect words are undetected either.
Any way to fix this problem?