Perhaps you should try some spelling variations:
nuoc biet » nuoc viet, nguoi biet, duoc bien
quoc viet » nuoc viet, hoc viet, ngoc viet
nghia cua » nghiep cua, nghia xa, nghia duy
nhung don » nhung van, nhung bo
vu sach » vu bach, su sach, vu khach
don doi » dong doi, uon doi, duong doi
doi va » hoi va, noi va, dai 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: vu sach (nha OR nhat) ((nuoc biet) OR (quoc viet)) nghia cua ets : nhung don doi va đai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach (nha or nhat) ((nuoc biet) OR (quoc viet)) nghia cua ets : nhung don doi va đai~".
• Adding a wildcard symbol may retrieve word variants: vu sach (nha or nhat) ((nuoc biet) OR (quoc viet)) nghia cua ets : nhung don doi va đai*.