Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tham vat hoc snippets" » "thai vat hoc snippets", "thuat vat hoc snippets", "pham van hoc snippets", "tham van hoc snippets", "tham va 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: (((("tham vat 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: (((("tham vat hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tham vat hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tham vat hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.