How to make a small slam in bridge with less than 30 points between the partnership?
I propose the following sequence playing a standard approach, with EW passing throughout:

1C 1D
1S     4 Spades, denying a hand suitable to rebid 1NT
   2H  4th Suit Forcing to game, suggesting dislike for NT
3C     5-card Club suit, dislikes NT also, often denies Heart control
   4C  agreeing clubs, still forcing, extras
4D     1st or 2nd round control in Diamonds
   4H  1st or 2nd round control in Hearts
6C     We have the controls, and 5C is almost always a bad result


Another possibility using Single Raise Forcing (10+ Pts)  is:

1C  2C  forcing raise, 4+ support and 13+ support points
2S      4 Spades, two suited with longer Clubs than Spades
    3H  Denies Diamond A or K, shows Heart A or K, Game Force
3S      Spade A or K and Diamond A or K or singleton denied by partner
    4H  Holding both A and K, or singleton A, of Hearts; and
        likes the Diamond and Spade controls from Opener
6C      Looks like a super fit


It is also faulty analysis to claim that NS have less than 30 points combined. The South hand is worth 16 to 17 points in a Club contract (15 HCP and either 1 point for the fifth Club or two points for the two doubletons) and the North hand is worth 16 Dummy points in a Club contract (14 HCP - 1 for the unsupported QS + 3 for the singleton Spade). This is a combined partnership strength of 32-33 points, and as the auctions above indicate that it is quite reasonable, using standard methods, to find the Club slam.

If finding reasonable slams were easy, they wouldn't be worth so much. Bridge is designed to reward those who can accurately reassess hand strength during the auction, in light of bidding by partner and the opponents.