Perhaps you should try some spelling variations:
"duong doi tinh snippets" » "duong loi tinh snippets", "dung doi tinh snippets", "huong doi tinh snippets", "duong doi trinh snippets", "duong hoi tinh snippets", "duong don tinh snippets", "duong doi tinh slippers"
"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: (((("duong doi tinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong doi tinh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong doi tinh snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong doi tinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.