Perhaps you should try some spelling variations:
nguoi sach » nguoi san, nuoc sach
phuc van » thuc van, phuc va, chuc van
cau phuc » cau truc, chau phu, huu phuc
va triet » va thiet, va trien, ve triet
hieu ke » hieu kem, chieu ke, hieu ky
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
hanh di » hanh de, hang di, danh di
ke cau » ket cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: nguoi sach ky ((nang xa) or (nang x)) hoi. hieu ke cau phuc van ((hanh di) or (hanh vi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nguoi sach ky ((nang xa) OR (nang x)) hoi. hieu ke cau phuc van ((hanh di) OR (hanh vi)) va triet.
• Adding a wildcard symbol may retrieve word variants: nguoi sach ky ((nang xa) or (nang x)) hoi. hieu ke cau phuc van ((hanh di) or (hanh vi)) va triet*.