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