Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham xuc » cam xuc, chat xuc, cham soc
cao hoi » cau hoi, co hoi, cao hoc
hieu vu » hieu va, hieu ve, dieu vu
hieu su » hieu sau, tieu su, hieu so
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 hoi. ((hieu vu) or (hieu su)) 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 hoi. ((hieu vu) OR (hieu su)) cham xuc ((va hanh) OR (va dan)) dau cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang cao hoi. ((hieu vu) or (hieu su)) cham xuc ((va hanh) or (va dan)) dau cua tre*.