Here is the list of Trie or Search related questions. Please go in sequence as previous one might be prerequisite for the next one.
For best understanding of Trie, please go through this page : https://leetcode.com/problems/implement-trie-prefix-tree/solution/

Problems :

1. https://leetcode.com/problems/implement-trie-prefix-tree
2. Add and Search Word https://leetcode.com/problems/design-add-and-search-words-data-structure/
3. https://leetcode.com/problems/word-search-ii/
4. https://leetcode.com/problems/design-search-autocomplete-system/
5. https://leetcode.com/problems/prefix-and-suffix-search/