Perhaps you should try some spelling variations:
"dong dan cach snippets" » "dong dan code snippets", "dong danh cach snippets", "duong dan cach snippets", "dong san cach snippets", "dong dan cac snippets", "dong dan canh snippets", "dong nhan cach 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 dan cach 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 dan cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong dan cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong dan cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.