Perhaps you should try some spelling variations:
su triet » su tien, ve triet
su sach » so sach, vu sach
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
sach vu » sach va, sach tu, sach uu
hai tuc » thai tuc, hai cuc, thai thuc
vu nang » vuc nang, va nang, vu dang
su viet » so viet
va hai » van hai, va chai, va khai
tuc va » thuc va, truc va, tuc xa
5 hoi » o hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach vu nang ((5 hoi) or (xa hoi)). lieu va hai tuc va hanh de ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach vu nang ((5 hoi) OR (xa hoi)). lieu va hai tuc va hanh de ((su triet) OR (su viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach vu nang ((5 hoi) or (xa hoi)). lieu va hai tuc va hanh de ((su triet) OR (su viet))*".