Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
dao thanh » ban thanh, tro thanh, de thanh
cham thuc » pham thuc, tham thuc, pham thuoc
day hanh » day nhanh, day thanh, dao hanh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
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 sach ky nang x hoi. hieu ve ((cham thuc) OR (nham thuc)) ((day hanh) or (dao thanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu ve ((cham thuc) OR (nham thuc)) ((day hanh) OR (dao thanh)) de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu ve ((cham thuc) OR (nham thuc)) ((day hanh) or (dao thanh)) de cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu ve ((cham thuc) OR (nham thuc)) ((day hanh) or (dao thanh)) de cua tre*.