Perhaps you should try some spelling variations:
"doi tuong phi snippets" » "moi truong phi snippets", "doi song phi snippets", "doi vuong phi snippets", "doi truong pho snippets", "doi duong phia snippets", "doi tuong phi slippers"
"python using a snippets" » "python using a 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: (((("doi tuong phi snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doi tuong phi snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi tuong phi snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi tuong phi snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.