Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
tinh hoc » sinh hoc, tin hoc, hinh hoc
viec cam » viec lam, viec cua, viec va
dang xay » dang van, van xay
cua tre » cuu tre, cua triet, dua tren
va tinh » may tinh
su sach » vu sach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
xuc va » duc va, tuc va, luc va
cua te » cua tu

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