Perhaps you should try some spelling variations:
duy nhanh » duy khanh, duy anh, duy phan
day nhanh » day thanh, dac nhan, day manh
day hanh » day thanh, dao hanh, day manh
cam thuc » am thuc, nam thuc, cam thu
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu ve cam thuc ((day hanh) or (((day nhanh) OR (duy nhanh)))) dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang o hoi. hieu ve cam thuc ((day hanh) OR (((day nhanh) OR (duy nhanh)))) dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang o hoi. hieu ve cam thuc ((day hanh) or (((day nhanh) OR (duy nhanh)))) dai cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang o hoi. hieu ve cam thuc ((day hanh) or (((day nhanh) OR (duy nhanh)))) dai cua te*.