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

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

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