Directly from "manus":
* Manual: A book of instructions, something done by hand.
* Manicure: Care for the hands and fingernails.
* Manuscript: A handwritten document.
* Emancipate: To set free, literally "to take out of the hand".
From "manus" combined with other Latin words:
* Manipulate: To handle or control skillfully, often in a devious way.
* Manufacture: To make something by hand, now used for industrial production.
* Manumission: The act of freeing a slave, literally "release from the hand".
* Manifest: To make clear or obvious, literally "to make evident by the hand".
* Manual dexterity: Skillful use of the hands.
Related to "manus" but not directly from it:
* Dexterous: Skillful with the hands.
* Ambidextrous: Able to use both hands equally well.
This is not an exhaustive list, but it gives you a good starting point for words that are related to the concept of "by hand".