Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
manh cua » doanh cua, ban cua
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
va manh » van manh, va danh, va hanh
tu sach » thu sach, su sach, te sach
hieu va » hieu qua
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
cac tuc » cac toc, cac tu, cac tac
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa

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 sang ma hoi. ((hieu va) OR (lieu va)) cac tuc va manh cua ((cuu tre) OR (cau theo))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ma hoi. ((hieu va) OR (lieu va)) cac tuc va manh cua ((cuu tre) or (cau theo))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoi. ((hieu va) OR (lieu va)) cac tuc va manh cua ((cuu tre) or (cau theo))*.