Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ke » hieu kem, chieu ke, hieu ky
cua tre » cua te, cuu tre, cua triet
ke cau » ket cau
loc va » hoc va
luc va » duc va, tuc va
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: tu sach ky nang x hoi. hieu ke cau ((loc va) OR (luc va)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ke cau ((loc va) OR (luc va)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ke cau ((loc va) OR (luc va)) hanh vi cua tre*.