Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
dang cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach _ dang cay phoi. hieu ve ((cam xuc) OR (nam thuc)) van hanh di cua te~.
• Adding a wildcard symbol may retrieve word variants: doc sach _ dang cay phoi. hieu ve ((cam xuc) or (nam thuc)) van hanh di cua te*.