Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tham duc » pham duc, tham du, than duc
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
v nang » va nang, van nang, voi nang
di cua » dai cua, doi cua, de cua
cua te » cua tu

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) or (vu nang)) xa hoi. hieu va tham duc va hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (vu nang)) xa hoi. hieu va tham duc va hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) or (vu nang)) xa hoi. hieu va tham duc va hanh di cua te*.