Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dang xay » dang van, van xay
duoc lac » duoc lam, duoc cac, duoc luan
qua duoc » qua buoc, cua duoc, luat duoc
lang xa » lang ha, lang van
sach ky » sac ky, sach y, sach ty
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
lac va » loc va, luc va, tac va

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: su sach ky ((lang xa) OR (dang xay)) hoi. hieu qua duoc lac va tinh va ((cua tre) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((lang xa) OR (dang xay)) hoi. hieu qua duoc lac va tinh va ((cua tre) or (su triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((lang xa) OR (dang xay)) hoi. hieu qua duoc lac va tinh va ((cua tre) or (su triet))*.