Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
toc sach » hoc sach, doc sach, thuoc sach
va nhanh » va thanh, va hanh, va nganh
tu sach » thu sach, su sach, te sach
va nhan » van nhan, ca nhan, va phan
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, xa hoi, ma hoa
ha cua » hoa cua, hai cua, nha cua
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (toc sach)) ky tang ma hoi. lieu va cau thuc ((va nhanh) OR (va nhan)) ha cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky tang ma hoi. lieu va cau thuc ((va nhanh) OR (va nhan)) ha cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky tang ma hoi. lieu va cau thuc ((va nhanh) OR (va nhan)) ha cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky tang ma hoi. lieu va cau thuc ((va nhanh) OR (va nhan)) ha cua tre*.