Perhaps you should try some spelling variations:
"dung vaaon code snippets" » "dung von code snippets", "dung van code snippets", "dung vao code snippets", "dung vaaaon code snippets", "dung viaaon code snippets", "dung veaaon 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 vaaon 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 vaaon code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung v code snippets ) or ( dung vaaon code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung v code snippets") or ("dung vaaon code snippets"))) or ("locating bug core snippets"))*.