Perhaps you should try some spelling variations:
"data using java snippets" » "data using data snippets", "data using java slippers"
"van tuan code snippets" » "van quan code snippets", "van ban code snippets", "anh tuan code snippets", "van tuan code slippers", "van tuan core snippets"
"locating bug code snippets" » "locating bug code slippers", "locating bug core snippets", "locating bung code snippets", "locating bugs code 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: (((("data using java snippets") or ("van tuan code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("data using java snippets") OR ("van tuan code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( data using java snippets ) or ( van tuan code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("data using java snippets") or ("van tuan code snippets"))) or ("locating bug code snippets"))*.