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OXF3000N 
vô ích vô dụng 
useless
like: vô dụng → →
When it comes to getting things done, he's useless. ☊ when it comes to sth/to doing sth ☊
When her husband left home she felt rejected and useless. ☊ reject ☊
This pen is useless. ☊ useless ☊
useless (doing sth): It's useless worrying about it. ☊ useless ☊
She tried to work, but it was useless (= she wasn't able to). ☊ useless ☊