Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
hieu kem » hieu ky, hieu ve
cau phuc » cau truc, chau phu, huu phuc
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
phuc va » phuc vu, thuc va, chuc va
sach ky » sac ky, sach y, sach ty
hieu ke » chieu ke, hieu ky, hieu ve
lang xa » lang ha, dang xay, lang van
sai ky » sac ky
di cau » da cau, diem cau

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: tu ((sach ky) OR (sai ky)) lang xa hoi. ((hieu ke) OR (hieu kem)) cau phuc va hanh di cau theo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sai ky)) lang xa hoi. ((hieu ke) OR (hieu kem)) cau phuc va hanh di cau theo~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sai ky)) lang xa hoi. ((hieu ke) OR (hieu kem)) cau phuc va hanh di cau theo*.