Perhaps you should try some spelling variations:
su triet » su viet, su tien
dang xay » dang van, van xay
ve triet » va trien
dang xa » lang xa, dang ha, dang va
sach ky » sac ky, sach y, sach ty
qua cau » quan cau, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
vu sach » vu bach, su sach, vu khach

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((dang xa) OR (dang xay)) hoi. hieu qua cau truc va hanh vi ((ve triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((dang xa) OR (dang xay)) hoi. hieu qua cau truc va hanh vi ((ve triet) or (su triet))~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((dang xa) OR (dang xay)) hoi. hieu qua cau truc va hanh vi ((ve triet) or (su triet))*.