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