Perhaps you should try some spelling variations:
"cong luan de snippets" » "tong luan de snippets", "cong tuan de snippets", "dong luan de snippets", "cong luan den snippets", "cong luan ve snippets", "cong luat de snippets"
"trong cac code snippets" » "trong cac cong snippets", "trong cac co snippets", "trong cac che snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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: (((("cong luan de snippets") or ("trong cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong luan de snippets") OR ("trong cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong luan de snippets ) or ( trong cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong luan de snippets") or ("trong cac code snippets"))) or ("locating bug code snippets"))*.