Perhaps you should try some spelling variations:
"data using java snippets" » "data using data snippets"
"dung tren do snippets" » "dung trong do snippets", "dung trung do snippets", "dung tren doi snippets", "dung trien do snippets", "dung tren co 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 tren 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 tren do snippets") OR ("data using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tren do snippets ) or ( data using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tren do snippets") or ("data using java snippets"))) or ("locating bug code snippets"))*.