Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dua tren » dung tren
cham tuc » nham thuc, pham thuc, tham thuc
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
vi dua » vi du, vi dum, vi lua

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: ((te sach) OR (thuoc sach)) ky dang ma hoi. hieu va cham tuc va danh vi dua tren~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) ky dang ma hoi. hieu va cham tuc va danh vi dua tren*.