Perhaps you should try some spelling variations:
"hanh trinh cac snippets" » "canh tranh cac snippets", "hanh chinh cac snippets", "hanh trinh cau snippets", "hanh trinh chat snippets", "hanh trinh chao snippets"
"dung luan de snippets" » "dung luan den snippets", "dung luan ve snippets", "dung luat de snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("hanh trinh cac snippets") or ("dung luan de snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh trinh cac snippets") OR ("dung luan de snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hanh trinh cac snippets ) or ( dung luan de snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh trinh cac snippets") or ("dung luan de snippets"))) or ("locating bug code snippets"))*.