Perhaps you should try some spelling variations:
"truong luat cac snippets" » "truong luan cac snippets", "truong cua cac snippets", "truong quan cac snippets", "truong luat can snippets", "truong luat cau snippets", "truong xuat cac snippets"
"dung java java snippets" » "dung va java 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: (((("truong luat cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("truong luat cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( truong luat cac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("truong luat cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.