Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
day nhanh » duy nhanh, dac nhan, day manh
cham thuc » nham thuc, pham thuc, pham thuoc
day thanh » dao thanh, dat thanh, da thanh
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 (tham thuc)) ((day thanh) or (day nhanh)) 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 (tham thuc)) ((day thanh) OR (day nhanh)) 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 (tham thuc)) ((day thanh) or (day nhanh)) de cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu ve ((cham thuc) OR (tham thuc)) ((day thanh) or (day nhanh)) de cua tre*.