Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
cau phuc » cau truc, chau phu, huu phuc
va hanh » van hanh, va thanh, va danh
phuc va » phuc vu, thuc va, chuc va
hieu va » lieu va, hieu qua
sach ky » sach y, sach ty, sach kem
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
vi cau » va cau, ve cau, di 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 (sac ky)) lang xa hoi. ((hieu ve) OR (hieu va)) cau phuc va hanh vi cau theo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) lang xa hoi. ((hieu ve) OR (hieu va)) cau phuc va hanh vi cau theo~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) lang xa hoi. ((hieu ve) OR (hieu va)) cau phuc va hanh vi cau theo*.