Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"dan tu hoc snippets" » "dan tu code snippets", "danh tu hoc snippets", "dan su hoc snippets", "ban tu hoc snippets", "dan te hoc snippets"
"python using raw snippets" » "python using real snippets", "python using a snippets", "python using low snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dan tu hoc snippets") OR ("python using raw snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"dan tu hoc snippets\") OR (\"python using raw snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( dan tu hoc snippets ) OR ( python using raw snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan tu hoc snippets") OR ("python using raw snippets"))) OR ("locating bug core snippets"))*.