Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
lai cua » dai cua, hai cua, lai chau
y hang » ly hang, ty hang, yu hang
ve cho » ve co, ve che, de cho
xu va » xu van, tu va, vu va
su va » su van, tu va

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 y hang ((xa hoi) or (x ho)). hieu ve cho ((xu va) OR (su va)) hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y hang ((xa hoi) OR (x ho)). hieu ve cho ((xu va) OR (su va)) hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y hang ((xa hoi) or (x ho)). hieu ve cho ((xu va) OR (su va)) hanh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach y hang ((xa hoi) or (x ho)). hieu ve cho ((xu va) OR (su va)) hanh lai cua viet*.