Perhaps you should try some spelling variations:
"dang quoc hoc snippets" » "dang thuoc hoc snippets", "han quoc hoc snippets", "dang quoc hoi snippets", "dang duoc hoc snippets", "dang buoc hoc 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 quoc hoc 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 quoc hoc snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang quoc hoc snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang quoc hoc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.