Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hieu hoc du snippets" » "lieu hoc du snippets", "hieu hoa du snippets", "tieu hoc du snippets", "hieu hoc duc snippets", "hieu hoc dau snippets", "hieu hoc dua 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: (((("hieu hoc 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: (((("hieu hoc du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hieu hoc du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu hoc du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.