Perhaps you should try some spelling variations:
"dua lang chai snippets" » "dua lang ha snippets", "dua lang cua snippets", "dua lang phi snippets", "cua lang chai snippets", "quan lang chai snippets", "dual land chai snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "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: (((("dua lang chai snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dua lang chai snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dua lang chai snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dua lang chai snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.