Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hieu hien » bieu hien, dieu hien, chieu chien
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
cac tu » cac thu, cach tu, cac du
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: tu sach ky nang ((x hoi) OR (o hoi)). ((hieu viec) or (hieu hien)) cac tu va hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (o hoi)). ((hieu viec) OR (hieu hien)) cac tu va hanh di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((x hoi) OR (o hoi)). ((hieu viec) or (hieu hien)) cac tu va hanh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) OR (o hoi)). ((hieu viec) or (hieu hien)) cac tu va hanh di cuu tre*.