Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
van hanh » ban hanh, van anh, van ban
vuc nang » cuc nang, chuc nang, van nang
hieu va » lieu va, hieu qua
vu nang » va nang, vu dang, v nang
su tien » su kien, su hien, tu tieng
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho
ve su » va su

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 ((vu nang) OR (vuc nang)) x hoi. hieu va cam xuc ((van hanh) OR (van thanh)) ve su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((vu nang) or (vuc nang)) x hoi. hieu va cam xuc ((van hanh) OR (van thanh)) ve su tien~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((vu nang) or (vuc nang)) x hoi. hieu va cam xuc ((van hanh) OR (van thanh)) ve su tien*.