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