Perhaps you should try some spelling variations:
"do van chieu snippets" » "do van code snippets", "do van hieu snippets", "do van chien snippets", "do van hien snippets", "dao van chieu snippets", "vo van chieu snippets", "so van chieu snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data 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: (((("do van chieu snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("do van chieu snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( do van chieu snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("do van chieu snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.