Perhaps you should try some spelling variations:
"lo van trong snippets" » "lo van truong snippets", "lo vang trong snippets", "lo ban trong snippets", "le van trong snippets", "vo van trong snippets", "so van trong snippets"
"python using c snippets" » "python using lc snippets", "python using a snippets", "python using _ snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"lo van trong snippets\") OR (\"python using c snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( lo van trong snippets ) OR ( python using c snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("lo van trong snippets") OR ("python using c snippets"))) OR ("locating bug code snippets"))*.