Perhaps you should try some spelling variations:
"oi quoc ban snippets" » "oi quoc bao snippets", "oi quoc lan snippets", "oi quoc quan snippets", "voi quoc ban snippets", "si quoc ban snippets", "mai quoc ban snippets", "oi quoc ban 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: (((("oi quoc ban snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oi quoc ban snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( oi quoc ban snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("oi quoc ban snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.