Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van tiep du snippets" » "van tien du snippets", "va tiep du snippets", "van hiep du snippets", "van tiep de snippets", "van tiep do snippets", "van tiep cua 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 tiep du 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 tiep du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tiep du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tiep du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.