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