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