Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"le xuan du snippets" » "le quang du snippets", "le xuan duc snippets", "le xuan huy snippets", "le xuan thu 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: "((((\"le xuan du snippets\") OR (\"python using java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( le xuan du snippets ) OR ( python using java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("le xuan du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets"))*.