Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
tham thuc » nham thuc, pham thuc, tam thuc
day hanh » day thanh, day manh, da hanh
dao hanh » dao thanh, dang hanh, ban hanh
bach ky » bac ky
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
de cua » le cua, te cua, dieu cua
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 bach ky nang x hoi. hieu ve tham thuc ((((day hanh) or (dao hanh))) or (day nhanh)) de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky nang x hoi. hieu ve tham thuc ((((day hanh) OR (dao hanh))) OR (day nhanh)) de cua te.
• Adding a wildcard symbol may retrieve word variants: vu bach ky nang x hoi. hieu ve tham thuc ((((day hanh) or (dao hanh))) or (day nhanh)) de cua te*.