Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
va lang » va nang, hoa lang
o lang » hoa lang, hoi lang
cam ly » tam ly, cam ky, cam lo
cam o » cham o, cam lo, ca o

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 ((va lang) OR (o lang)) xa hoi. hieu va ((cam ly) OR (cam o)) va hanh dai cua triet~.
• Adding a wildcard symbol may retrieve word variants: toc sach ((va lang) or (o lang)) xa hoi. hieu va ((cam ly) or (cam o)) va hanh dai cua triet*.