Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hau hon snippets" » "van ha hon snippets", "van hai hon snippets", "van dau hon snippets", "van hau mon snippets", "van hay hon snippets", "van phau hoc 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 hau hon 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 hau hon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van hau hon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van hau hon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.