Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dong hoc c1 snippets" » "dong co c1 snippets", "dong luc c1 snippets", "dong hoc co snippets", "dong hoc 11 snippets", "dong hoc ca 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: (((("dong hoc c1 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong hoc c1 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong hoc c1 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong hoc c1 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.