Perhaps you should try some spelling variations:
"cho viet lao snippets" » "co viet lao snippets", "tho viet lao snippets", "ho viet lao snippets", "cho viet giao snippets", "cho viet nam snippets", "cho viet ha snippets", "cho viet lao slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("cho viet lao snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cho viet lao snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cho viet lao snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cho viet lao snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.