Perhaps you should try some spelling variations:
"dung thuc cua snippets" » "dung thuoc cua snippets", "duong thuc cua snippets", "dung thu cua snippets", "dung hoc cua snippets", "dung thuc va snippets"
"luong va java snippets" » "dung va java snippets", "luong java java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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 ("dung thuc cua snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luong va java snippets") OR ("dung thuc cua snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luong va java snippets ) or ( dung thuc cua snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luong va java snippets") or ("dung thuc cua snippets"))) or ("locating bug code snippets"))*.