Perhaps you should try some spelling variations:
"dung viaon code snippets" » "dung von code snippets", "dung giao code snippets", "dung van code snippets", "dung vaiaon code snippets", "dung viiaon code snippets", "dung veiaon code snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung v code snippets" » "dung va code snippets", "dung vi code snippets", "dung ve 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: (((("dung v code snippets") or ("dung viaon code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung v code snippets") OR ("dung viaon code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung v code snippets ) or ( dung viaon code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung v code snippets") or ("dung viaon code snippets"))) or ("locating bug core snippets"))*.