Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu viec » nhieu viec, hieu ve, sieu viet
su sach » so sach, vu sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cach tu » cach thuc
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
di cuu » di cau, di cua, dinh cuu
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 viec) or (hieu hien)) cach tu va hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (o hoi)). ((hieu viec) OR (hieu hien)) cach tu va hanh di cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) or (o hoi)). ((hieu viec) or (hieu hien)) cach tu va hanh di cuu tre*.