Perhaps you should try some spelling variations:
"dung vinh trac snippets" » "dang vinh trac snippets", "dung ninh trac snippets", "quang vinh trac snippets", "dung sinh trac snippets", "dung vinh tran snippets", "dung anh trac snippets", "dung vinh trac slippers"
"using _ code snippets" » "using _ code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

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

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