Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van trinh di snippets" » "van thinh di snippets", "van tinh di snippets", "dan trinh di snippets", "van trinh do snippets", "van trinh dien snippets", "van trinh dinh 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 trinh di 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 trinh di snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van trinh di snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van trinh di snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.