Perhaps you should try some spelling variations:
"data using java snippets" » "data using data snippets"
"dung tap toan snippets" » "dung tai toan snippets", "dung tay toan snippets", "dung lap toan snippets", "dung tap doan snippets", "dung tap quan snippets", "dung bai toan 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 tap toan 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 tap toan snippets") OR ("data using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tap toan snippets ) or ( data using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tap toan snippets") or ("data using java snippets"))) or ("locating bug code snippets"))*.