Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
lang xa » lang ha, dang xay, lang van
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: toc sach _ lang xa hoi. hieu ve ((cam xuc) OR (nam thuc)) van hanh di cua te~.
• Adding a wildcard symbol may retrieve word variants: toc sach _ lang xa hoi. hieu ve ((cam xuc) or (nam thuc)) van hanh di cua te*.