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