Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"cu van du snippets" » "cuu van du snippets", "chu van du snippets", "cau van du snippets", "cu van duy snippets", "cu van dau snippets", "cu van de 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: "((((\"python missing data snippets\") OR (\"cu van du snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( python missing data snippets ) OR ( cu van du snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("python missing data snippets") OR ("cu van du snippets"))) OR ("locating bug code snippets"))*.