Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van phung da snippets" » "van phong da snippets", "van hung da snippets", "van chuong da snippets", "van phung dang snippets", "van phung van snippets", "van phung duc 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 phung da 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 phung da snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van phung da snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van phung da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.