Perhaps you should try some spelling variations:
"data using java snippets" » "data using data snippets"
"dung nhat code snippets" » "dung nhan code snippets", "dang nhat code snippets", "dung nha code snippets", "dung nhat de snippets", "dung nhat co snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

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: (((("data using java snippets") or ("dung nhat code snippets"))) or ("locating bug code slippers"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("data using java snippets") OR ("dung nhat code snippets"))) OR ("locating bug code slippers")).
• Removing quotes may allow a broader search: (((( data using java snippets ) or ( dung nhat code snippets ))) or ( locating bug code slippers )).
• Adding a wildcard symbol may retrieve word variants: (((("data using java snippets") or ("dung nhat code snippets"))) or ("locating bug code slippers"))*.