Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » tu sach, thuat sach, thuoc sach
vien bac » vien bach, vien cac, mien bac
so sach » so sanh, bo sach, co sach
bac can » ban can, bat can, tac can
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
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: ((thu sach) or (so sach)) ky nang x hoi. hieu vien bac can ((va danh) OR (va hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (so sach)) ky nang x hoi. hieu vien bac can ((va danh) OR (va hanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (so sach)) ky nang x hoi. hieu vien bac can ((va danh) OR (va hanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (so sach)) ky nang x hoi. hieu vien bac can ((va danh) OR (va hanh)) dai cua tre*.