Perhaps you should try some spelling variations:
nam trung » nam trong, tai trung, ba trung
ve triet » va trien
su triet » su viet, su tien
van nang » van quang, van ban, van dong
va thanh » gia thanh, ban thanh, va tinh
trung va » truong va, trang va, trung ha
su sach » so sach, vu sach
hieu he » hieu ve, hiem he, hieu le
v nang » va nang, vu nang, voi nang
he nam » ha nam, nghe nam

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 ((v nang) OR (van nang)) xa hoi. hieu he nam trung va thanh pho ((su triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) OR (van nang)) xa hoi. hieu he nam trung va thanh pho ((su triet) or (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) OR (van nang)) xa hoi. hieu he nam trung va thanh pho ((su triet) or (ve triet))*.