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