Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
nam thuc » nam thuoc, am thuc, nam thu
cam thuc » am thuc, cam thu, can thuc
day hanh » day nhanh, dao hanh, day manh
hoi cua » hoi chuc
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
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 sach ky nang x hoi. hieu ve ((cam thuc) OR (nam thuc)) ((day hanh) or (day thanh)) hoi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu ve ((cam thuc) OR (nam thuc)) ((day hanh) OR (day thanh)) hoi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu ve ((cam thuc) OR (nam thuc)) ((day hanh) or (day thanh)) hoi cua te*".