Perhaps you should try some spelling variations:
tiep tieng » tap tieng, tien tien, tiep trong
nhieu viec » hieu viec, nhien viet
sach nuoc » sach duoc, cac nuoc, bach tuoc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu
x hoi » xa hoi, x ho, 5 hoi
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 ((x hoi) or (o hoi)). ((tiep tieng) or (nhieu viec)) sach nuoc 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)). ((tiep tieng) OR (nhieu viec)) sach nuoc va hanh di cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) or (o hoi)). ((tiep tieng) or (nhieu viec)) sach nuoc va hanh di cuu tre*.