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