Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"hang tap toan snippets" » "hang tai toan snippets", "han tap toan snippets", "hang tmcp toan snippets", "hang tap doan snippets", "hang tap quan snippets", "hang bai toan 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 tap toan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hang tap toan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hang tap toan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hang tap toan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.