Perhaps you should try some spelling variations:
van triet » va triet, van thiet, van trieu
day nhanh » day thanh, duy nhanh, dac nhan
nhanh de » hanh de, thanh de, nhanh dien
thuc day » thuc dan, thuc vat
vien cac » vien bach, vien dai, vien da
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
ve cam » ve cham, ve cac, va cam
de van » le van, do van, ve van
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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