Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van vai cac snippets" » "van hai cac snippets", "van vat cac snippets", "van van cac snippets", "van va cac snippets", "van tai cac snippets", "van voi cac snippets"
"locating bug code snippets" » "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: (((("van vai cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van vai cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van vai cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van vai cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.