Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
tinh hoi » trinh hoi, tinh hoc, tinh hoa
tinh hai » tinh thai, tinh chat, trinh han
viec cam » viec lam, viec cua, viec va
cua tre » cua te, cua triet, dua tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
xuc va » duc va, tuc va, luc va

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 xa hoi. nhieu viec cam xuc va ((tinh hoi) OR (tinh hai)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. nhieu viec cam xuc va ((tinh hoi) OR (tinh hai)) ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. nhieu viec cam xuc va ((tinh hoi) OR (tinh hai)) ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. nhieu viec cam xuc va ((tinh hoi) OR (tinh hai)) ((cua tre) or (cuu tre))*.