Perhaps you should try some spelling variations:
"data using java snippets" » "data using data snippets"
"dung sach cau snippets" » "duong sach cau snippets", "dung sai cau snippets", "dung cac cau snippets", "dung sach cap snippets", "dung sach dau snippets", "dung sach mau 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 sach cau 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 sach cau snippets") OR ("data using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung sach cau snippets ) or ( data using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung sach cau snippets") or ("data using java snippets"))) or ("locating bug code snippets"))*.