Perhaps you should try some spelling variations:
"doan dieu con snippets" » "nhan dieu con snippets", "dang dieu con snippets", "toan dien con snippets", "doan dieu can snippets", "doan diet con snippets", "doan dieu co 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: (((("doan dieu con snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doan dieu con snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doan dieu con snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doan dieu con snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.