Perhaps you should try some spelling variations:
"dung quang code snippets" » "dang quang code snippets", "luong quang code snippets", "dung luan code snippets", "dung quang de snippets", "dung quang code slippers"
"pham van code snippets" » "pham van de snippets", "pham van hoe snippets", "pham van cong snippets", "pham van code slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("dung quang code snippets") or ("pham van code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung quang code snippets") OR ("pham van code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung quang code snippets ) or ( pham van code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung quang code snippets") or ("pham van code snippets"))) or ("locating bug code snippets"))*.