Perhaps you should try some spelling variations:
"cua dat khanh snippets" » "cua van khanh snippets", "cua duy khanh snippets", "cua dan khanh snippets", "cua vat khanh snippets", "cua dai khanh snippets", "cua dat khanh 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: (((("cua dat khanh snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cua dat khanh snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cua dat khanh snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cua dat khanh snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.