Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"than hoc voi snippets" » "toan hoc voi snippets", "thai hoc voi snippets", "than doc voi snippets", "than hoc vi snippets", "than hoc vo snippets", "than hoc noi 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: (((("than hoc voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("than hoc voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( than hoc voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("than hoc voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.