Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
xay hoi » xa hoi, cay phoi, gay thoi
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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: thu sach ky dang ((xay hoi) OR (tay hoi)). thien van cau ((xuc va) OR (tuc va)) hanh dai cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky dang ((xay hoi) OR (tay hoi)). thien van cau ((xuc va) or (tuc va)) hanh dai cua vat~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky dang ((xay hoi) OR (tay hoi)). thien van cau ((xuc va) or (tuc va)) hanh dai cua vat*.