Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang ho » nang hoc, nang co, tang ho
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va dinh » van dinh, va kinh, va tinh
dinh di » dinh du, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
nang o » nang co, nang ro, nang x
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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 v ((nang o) or (nang ho)) hoi. hieu va cam luc va dinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v ((nang o) OR (nang ho)) hoi. hieu va cam luc va dinh di cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach v ((nang o) or (nang ho)) hoi. hieu va cam luc va dinh di cua tre*.