Perhaps you should try some spelling variations:
dang xay » dang van, van xay
su triet » su viet, su tien, ve triet
te sach » toc sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, lang van
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty ((lang xa) or (dang xay)) hoi. hieu qua cac duc va danh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((lang xa) OR (dang xay)) hoi. hieu qua cac duc va danh vi su triet.
• Adding a wildcard symbol may retrieve word variants: te sach ty ((lang xa) or (dang xay)) hoi. hieu qua cac duc va danh vi su triet*.