Perhaps you should try some spelling variations:
"dong duoc cong snippets" » "dong duoc code snippets", "dong quoc cong snippets", "dong duong cong snippets", "trong duoc cong snippets", "dong nuoc cong snippets", "dong duc cong snippets", "dong duoc dong 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 duoc 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 duoc cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong duoc cong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong duoc cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.