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
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cua tre » cuu tre, cua triet, dua tren
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
cua te » cua tu
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: vu sac ky nang x hoi. hieu van cham thuc ((day hanh) or (day nhanh)) de ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang x hoi. hieu van cham thuc ((day hanh) OR (day nhanh)) de ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang x hoi. hieu van cham thuc ((day hanh) or (day nhanh)) de ((cua tre) or (cua te))*.