Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
day hanh » day nhanh, day thanh, dao hanh
dac nhan » cac nhan, danh nhan, ca nhan
cua tre » cua te, cuu tre, cua triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tu » cua tuc, cua su, cua cu
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 sach ky nang x hoi. hieu ve cham thuc ((day hanh) or (dac nhan)) de ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu ve cham thuc ((day hanh) OR (dac nhan)) de ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu ve cham thuc ((day hanh) or (dac nhan)) de ((cua tre) or (cua tu))*.