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