Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va dinh » van dinh, va tinh, vu dinh
hoi cua » hoi chuc
va kinh » va tinh, qua kinh
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
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: ((te sach) OR (toc sach)) ky nang x hoi. hieu ve cam luc ((va dinh) or (va kinh)) hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang x hoi. hieu ve cam luc ((va dinh) OR (va kinh)) hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky nang x hoi. hieu ve cam luc ((va dinh) or (va kinh)) hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky nang x hoi. hieu ve cam luc ((va dinh) or (va kinh)) hoi cua tre*.