Perhaps you should try some spelling variations:
cua viet » hoa viet, cua vat, cua dieu
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
ca viet » va viet, co viet, hoa viet
ty hang » ly hang, ty xang, thi hang
va cam » va cham, va cao, va cai
tuc va » thuc va, truc va, tuc xa
hang x » nang x, hoang xa, chang xu
x hoi » xa hoi, o hoi, x ho

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