Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
day nhanh » day thanh, duy nhanh, dac nhan
day hanh » day thanh, dao hanh, day manh
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
ve nham » ve nha, ve cham
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
de cuu » de cua
x hoi » o 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: vu sach ky nang ((x hoi) OR (xa hoi)). hieu ve nham thuc ((day hanh) or (day nhanh)) de cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((x hoi) OR (xa hoi)). hieu ve nham thuc ((day hanh) OR (day nhanh)) de cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang ((x hoi) OR (xa hoi)). hieu ve nham thuc ((day hanh) or (day nhanh)) de cuu tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((x hoi) OR (xa hoi)). hieu ve nham thuc ((day hanh) or (day nhanh)) de cuu tre*.