Perhaps you should try some spelling variations:
national training » vocational training, national planning, occupational training
training can » training bank, training case, training cnns
lang yan » wang yan, wang yang, zhang yan
can dang » can bank, can data, can deny
dong di » dong sin
y a » y la
hai » hadi, haji, hari

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((lang yan) or (dong di)) ((a la) or (y a)) national training can dang hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((lang yan) OR (dong di)) ((a la) OR (y a)) national training can dang hai ;*.