unable to help however much one would like to (idiom); Although we sympathize, there is no way to help you.
My hands are tied.
Definitions (粵典–words.hk)
語句
想幫忙,但係無能為力 willing to help but unable to do so
我好同情你,不過我自己都未顧得掂,今次真係愛莫能助喇。
我好同情你,不过我自己都未顾得掂,今次真系爱莫能助喇。
ngo5 hou2 tung4 cing4 nei5, bat1 gwo3 ngo5 zi6 gei2 dou1 mei6 gu3 dak1 dim6, gam1 ci3 zan1 hai6 oi3 mok6 nang4 zo6 laa3. I am empathetic for you, but I can't even take care of myself now. I'd really want to but there is no way I could help.
Definitions (Wiktionary)
phrase, idiomatic
unable to help, despite wanting to