Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
day thanh » dao thanh, dat thanh, da thanh
day hanh » day nhanh, dao hanh, day manh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
de cua » le cua, te cua, dieu cua
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 ve cham thuc ((day hanh) or (day thanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang x hoi. hieu ve cham thuc ((day hanh) OR (day thanh)) de cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang x hoi. hieu ve cham thuc ((day hanh) or (day thanh)) de cua tre*.