Perhaps you should try some spelling variations:
"cong thuc cac snippets" » "cong tac cac snippets", "cong thuc cach snippets", "cong tuc cac snippets", "cong phuc cac snippets"
"hang va java snippets" » "hang java java snippets", "nang va java snippets", "dang va java snippets", "hanh 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: (((("hang va java snippets") or ("cong thuc cac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hang va java snippets") OR ("cong thuc cac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hang va java snippets ) or ( cong thuc cac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hang va java snippets") or ("cong thuc cac snippets"))) or ("locating bug code snippets"))*.