Perhaps you should try some spelling variations:
te sach » toc sach
dau cua » dai cua, day cua, cau cua
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu vu » hieu va, hieu ve, hieu su
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
va dao » ca dao
vu cam » vu cham, vu cao, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((cao hoi) OR (cao hoc)). hieu vu cam xuc ((va hanh) or (va dao)) dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((cao hoi) OR (cao hoc)). hieu vu cam xuc ((va hanh) OR (va dao)) dau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((cao hoi) OR (cao hoc)). hieu vu cam xuc ((va hanh) or (va dao)) dau cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((cao hoi) OR (cao hoc)). hieu vu cam xuc ((va hanh) or (va dao)) dau cua tre*.