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