Perhaps you should try some spelling variations:
"hanh van chien snippets" » "hanh van hien snippets", "hanh van hieu snippets", "hanh van tien snippets", "thanh van chien snippets", "khanh van chien snippets", "hanh va chien snippets"
"dung java java snippets" » "dung 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: (((("hanh van chien snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh van chien snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hanh van chien snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh van chien snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.