Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
viec cam » viec lam, viec cua, viec va
tu sach » thu sach, su sach, te sach
so sach » so sanh, bo sach, co sach
xay hoi » xa hoi, tay hoi, cay phoi
hoc cuu » hoc huu, hoc cua, hoc cau
cuu tre » cua tre, cau tren, cau treo
ky van » ly van, ty van, ky 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) or (so sach)) ky van xay hoi. nhieu viec cam xuc ((va tinh) OR (may tinh)) hoc cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky van xay hoi. nhieu viec cam xuc ((va tinh) OR (may tinh)) hoc cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (so sach)) ky van xay hoi. nhieu viec cam xuc ((va tinh) OR (may tinh)) hoc cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky van xay hoi. nhieu viec cam xuc ((va tinh) OR (may tinh)) hoc cuu tre*.