Perhaps you should try some spelling variations:
"luong java java snippets" » "luong va java snippets"
"dung viet cac snippets" » "nang viet cac snippets", "cong viet cac snippets", "mang viet cac snippets", "dung vien cac snippets", "dung viet ca snippets", "dung viet bac 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 java java snippets") or ("dung viet cac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luong java java snippets") OR ("dung viet cac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luong java java snippets ) or ( dung viet cac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luong java java snippets") or ("dung viet cac snippets"))) or ("locating bug code snippets"))*.