Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
cua viet » ca viet, cua vat, cua dieu
doc sach » hoc sach, nuoc sach, dac sac
chat tuc » chat xuc, luat tuc, chat huu
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
v nang » va nang, vu nang, van nang

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: ((toc sach) OR (doc sach)) v nang ma hoi. hieu ve chat tuc va hanh di ((cua viet) OR (hoa viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) v nang ma hoi. hieu ve chat tuc va hanh di ((cua viet) or (hoa viet))~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) v nang ma hoi. hieu ve chat tuc va hanh di ((cua viet) or (hoa viet))*.