Perhaps you should try some spelling variations:
"dung cua co snippets" » "dung luan co snippets", "dung cho co snippets", "dung cua bo snippets", "dung cua cong snippets"
"quan vi code snippets" » "quan li code snippets", "quan tri code snippets", "quan doi code snippets", "quan vi core snippets"
"locating bug code snippets" » "locating bug core 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: (((("quan vi code snippets") or ("dung cua co snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("quan vi code snippets") OR ("dung cua co snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quan vi code snippets ) or ( dung cua co snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quan vi code snippets") or ("dung cua co snippets"))) or ("locating bug code snippets"))*.