Perhaps you should try some spelling variations:
"dung tang cho snippets" » "dung thang cho snippets", "dung dang cho snippets", "dung nang cho snippets", "dung trang cho snippets", "dung sang cho snippets", "dung hang cho 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: (((("dung tang cho snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung tang cho snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tang cho snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tang cho snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.