Perhaps you should try some spelling variations:
"duong thuc hanh snippets" » "luong thuc hanh snippets", "duong thu hanh snippets", "duong thuy hanh snippets", "duong thuc hanh slippers", "duong thuc thanh snippets", "duong thuc anh snippets", "duong thuc hinh snippets"
"dung java java snippets" » "dung va java snippets", "dung java java 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: (((("dung java java snippets") or ("duong thuc hanh snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("duong thuc hanh snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( duong thuc hanh snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("duong thuc hanh snippets"))) or ("locating bug code snippets"))*.