Perhaps you should try some spelling variations:
"ngan ngu lap trinh." » "ngon ngu lap trinh." (Expand Search), "ngan nu lap trinh." (Expand Search), "han ngu lap trinh." (Expand Search), "ngan ngu phap trinh." (Expand Search)
"ngan nam lap trinh." » "ngan hay lap trinh." (Expand Search), "ngan nam lao trinh." (Expand Search), "ngan nam lan trinh." (Expand Search), "ngan nam lam trinh." (Expand Search), "ngan ngam lap trinh." (Expand Search), "ngan vam lap trinh." (Expand Search), "ngan num lap trinh." (Expand Search)
"ngan na lap trinh." » "ngan nga lap trinh." (Expand Search), "ngan va lap trinh." (Expand Search), "ngan nu lap trinh." (Expand Search), "ngan nang lap trinh." (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("ngan ngu lap trinh.") OR ((("ngan nam lap trinh.") OR ("ngan na lap trinh."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ngan ngu lap trinh.\") OR (((\"ngan nam lap trinh.\") OR (\"ngan na lap trinh.\"))))".
• Removing quotes may allow a broader search: (( ngan ngu lap trinh. ) OR ((( ngan nam lap trinh. ) OR ( ngan na lap trinh. )))).
• Adding a wildcard symbol may retrieve word variants: (("ngan ngu lap trinh.") OR ((("ngan nam lap trinh.") OR ("ngan na lap trinh."))))*.