Perhaps you should try some spelling variations:
"cong cua do snippets" » "cong cu do snippets", "dong cua do snippets", "huong cua do snippets", "cong cua dao snippets", "cong cua bo snippets", "cong cua co snippets"
"hanh va java snippets" » "hang va java snippets", "hanh vi java snippets", "hanh java 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: (((("hanh va java snippets") or ("cong cua do snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh va java snippets") OR ("cong cua do snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hanh va java snippets ) or ( cong cua do snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh va java snippets") or ("cong cua do snippets"))) or ("locating bug code snippets"))*.