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