Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"co trach du snippets" » "bo trach du snippets", "co tranh du snippets", "co tich du snippets", "co thach duc snippets", "co tranh dau 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: (((("co trach du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("co trach du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( co trach du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("co trach du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.