Look carefully at the 5 books you receive and decide whether to keep them or not. Sometimes it is advisable to throw them all to improve your chances of winning. See what winning combinations you have the chance to accomplish by keeping books. It is always advisable to keep 2 pairs, three pieces of the same type, four of the same value, do not say the Color Straight or Royal Straight to be retained if you catch it for the first time in a book.
If you have two pairs you can change the fifth card and thus increase your chances to make full (3 cards the same as a pair). If you have a Full House first you do not change anything because throwing some cards and changing them hard can get a better combination. When you have three cards that can help form a Chinte Royale, the remaining two remaining cards are retained and changed. Do not give up, you may not have the luck of a combination of this level and do not change three cards the same, you can only remove the rest of the cards (the two different) to get new ones, the chance may be to get a more valuable combination, such as a Full.