Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
trinh do » trinh ky
tinh doi » trinh doc, tinh hoc, tinh son
dang tay » dang xay, dung tay, dan tay
viec va » vien va, viec cua, viec lam
tu sach » thu sach, su sach, te sach
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
va duc » van duc, va duoc, va doc

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 dang tay hoi. nhieu viec va duc va ((tinh doi) or (trinh do)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky dang tay hoi. nhieu viec va duc va ((tinh doi) OR (trinh do)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky dang tay hoi. nhieu viec va duc va ((tinh doi) or (trinh do)) cua tre*.