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