Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
van triet » va triet, van thiet, van trieu
vien cac » vien bach, vien dai, vien da
thuc day » thuc dan, thuc vat
nhanh do » nhanh doc, thanh do, nhanh dong
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ve cham » va cham, ve chat, vu cham
nang o » nang co, nang ho, nang ro
do van » dao van, vo van, so van
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: su sach ky nang o hoi. hieu ((ve cham) or (vien cac)) thuc day nhanh do van triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang o hoi. hieu ((ve cham) OR (vien cac)) thuc day nhanh do van triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang o hoi. hieu ((ve cham) or (vien cac)) thuc day nhanh do van triet*.