Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
cam thuc » am thuc, cam thu, can thuc
nam thuc » nam thuoc, am thuc, nam thu
day hanh » day thanh, dao hanh, day manh
cau treo » cau theo, cau tren, cau triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
di cau » da cau, diem cau
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 qua ((cam thuc) or (nam thuc)) ((day hanh) or (day nhanh)) di cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu qua ((cam thuc) OR (nam thuc)) ((day hanh) OR (day nhanh)) di cau treo.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu qua ((cam thuc) or (nam thuc)) ((day hanh) or (day nhanh)) di cau treo*.