1 - To make a bomb chip. Lotus task counts all bomb chips, no matter how they appear.
2 - To make a combination - match 5, match-6 or match-7. The Lotus task counts combination only if you made it by your own move. If a combination is produced as a result of cascades (matches produced by other matches, they occur when you make a move at the bottom of the board and chips start falling down), it’s not counted in the Lotus quest.
So if you got task to make combination, please make them as shown on the videos below:
Match5 - Fiery Ring bomb https://youtu.be/MuCeL3bTLS8
Match5 - Vertical Lightning Bomb https://youtu.be/9km-wfgt75I
Match5 - Horizontal Lightning Bomb https://youtu.be/LjcuU5quCMQ
Match6 - Superlightning Bomb https://youtu.be/p5giy5SgutQ
Match7 - Magic Ball https://youtu.be/REI-sSTyMM8