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