Perhaps you should try some spelling variations:
tac dung » sach dung, xay dung, tin dung
van dinh » van minh, van dich, va dinh
dinh tri » chinh tri
vien cac » vien bach, vien dai, vien da
den van » dien van, nen van, de van
dan thi » dang thi, tran thi, dinh thi
te tac » te tai, ve tac, te cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( te tac dung tai ) or ( den van dinh tri ))) or ( vien cac dan thi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( te tac dung tai ) OR ( den van dinh tri ))) OR ( vien cac dan thi )).
• Adding a wildcard symbol may retrieve word variants: (((( te tac dung tai ) or ( den van dinh tri ))) or ( vien cac dan thi ))*.