If the hands do not show on any buildings, then the player has no buildings that can receive help. Remember:
- on PC you can't give NH to a Main Hall that is being upgraded (on mobile you can)
- there's a limit to the number of NH you can give to the Builders' Hut equal to the level of the Hut. For example a level 2 Builders' Hut can only receive help twice (then the player needs to spend one of the two before the Hut can receive more)
- you can't give NH to a Culture building that has already received NH - you need to wait for the effect to expire first
- also, the smallest Culture buildings (1x2, 2x1, 1x3, 3x1, and some 1x4 and 4x1) cannot receive NH at all