Perhaps you should try some spelling variations:
"data using java snippets" » "data using data snippets"
"tung dan chen snippets" » "dung dan chen snippets", "huong dan chen snippets", "trung dai chen snippets", "tung dan chan snippets", "tung yan chen snippets", "tung can chien 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: (((("tung dan chen snippets") or ("data using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tung dan chen snippets") OR ("data using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tung dan chen snippets ) or ( data using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tung dan chen snippets") or ("data using java snippets"))) or ("locating bug code snippets"))*.