Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"che hoc cong snippets" » "che hoc co snippets", "che cac cong snippets", "che hoc dung snippets", "cho hoc cong snippets", "che ho cong snippets", "che thuoc cong 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: (((("che hoc cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("che hoc cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( che hoc cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("che hoc cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.