Isn't it "he always grumbles to me ABOUT his job"?
MINH....why isnt it AT MY JOB?
Is it to do with verbs?
Toi tich nha cua minh....my house.
Toi moun co ay tre cho mon an cua minh....her food.
Minh could refer to "anh ấy" or "tôi", say "của anh ấy" or "của tôi" to avoid any ambiguity ?
Is cằn nhằn the same sa gắt gỏng?
"Grumbles about his job to me" may not be eloquent but it is not wrong.
You missed out "always".