Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van phoi hoc snippets" » "van choi hoc snippets", "van hoi hoc snippets", "van khoi hoc snippets", "van phoi thuoc snippets", "van hoa 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 phoi hoc 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 phoi hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van phoi hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van phoi hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.