Perhaps you should try some spelling variations:
nhieu viec » nhien viet
hieu viec » hieu ve, sieu viet, hieu hien
trinh he » trinh han, trinh hoa, trinh thi
dang xay » dang van, van xay
tinh he » hinh he, tinh ha, tich he
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
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: so sach ky dang xay hoi. ((nhieu viec) or (hieu viec)) cam xuc va ((tinh he) OR (trinh he)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang xay hoi. ((nhieu viec) OR (hieu viec)) cam xuc va ((tinh he) OR (trinh he)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky dang xay hoi. ((nhieu viec) or (hieu viec)) cam xuc va ((tinh he) OR (trinh he)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky dang xay hoi. ((nhieu viec) or (hieu viec)) cam xuc va ((tinh he) OR (trinh he)) cua tre*.