Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet
ve bac » ve bao, ve cac, ve ban
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang x hoi. hieu ve bac bo ((va hanh) OR (va danh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ve bac bo ((va hanh) OR (va danh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ve bac bo ((va hanh) OR (va danh)) vi cua tre*.