Perhaps you should try some spelling variations:
"dung so cong snippets" » "dung so code snippets", "dung co cong snippets", "dung mo cong snippets", "dung cho cong snippets", "dung bo cong snippets", "dung cao cong snippets", "dung hoc cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"duong java java snippets" » "duong va 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: (((("duong java java snippets") or ("dung so cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong java java snippets") OR ("dung so cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( duong java java snippets ) or ( dung so cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong java java snippets") or ("dung so cong snippets"))) or ("locating bug core snippets"))*.