Perhaps you should try some spelling variations:
"dang dung code snippets" » "dan dung code snippets", "dang hung code snippets", "dang quang code snippets", "dang dung cong snippets", "dang dung co snippets", "dang dung de snippets"
"locating bug core snippets" » "locating bug code snippets"
"dong va java snippets" » "dung va java snippets", "dong ha java snippets", "luong va java snippets", "dong java java 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: (((("dong va java snippets") or ("dang dung code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong va java snippets") OR ("dang dung code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong va java snippets ) or ( dang dung code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong va java snippets") or ("dang dung code snippets"))) or ("locating bug core snippets"))*.