Perhaps you should try some spelling variations:
"data using java snippets" » "data using data snippets"
"dung tin do snippets" » "dong tin do snippets", "luong tin do snippets", "dung tren do snippets", "dung tien do snippets", "dung tin don snippets", "dung tinh do 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 tin do 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 tin do snippets") OR ("data using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tin do snippets ) or ( data using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tin do snippets") or ("data using java snippets"))) or ("locating bug code snippets"))*.