Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hieu vu » hieu va, hieu ve, hieu su
vu chat » va chat, ve chat, du chat
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va
di cua » dai cua, doi cua, de 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) or (thu sach)) ky nang x hoi. hieu vu chat ((xuc va) OR (duc va)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x hoi. hieu vu chat ((xuc va) OR (duc va)) hanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang x hoi. hieu vu chat ((xuc va) OR (duc va)) hanh di cua tre*".