Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van bac » van bao, dan bac, van bau
van hac » van hoc, van ha, van hai
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
danh de » hanh de, dan de, dang de
de cua » le cua, te cua, dieu cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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: su sach ky nang x hoi. hieu ((((van bac) OR (van ban))) OR (van hac)) truc va danh de cua te~.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((((van bac) or (van ban))) or (van hac)) truc va danh de cua te*.