Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
day nhanh » day thanh, duy nhanh, dac nhan
day hanh » day thanh, dao hanh, day manh
ve cham » va cham, ve chat, vu cham
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
di cuu » di cau, di cua, dinh cuu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y nang) or (v nang)) x hoi. hieu ve cham thuc ((day hanh) or (day nhanh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) x hoi. hieu ve cham thuc ((day hanh) OR (day nhanh)) di cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) x hoi. hieu ve cham thuc ((day hanh) or (day nhanh)) di cuu tre*.