Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
trinh doc » trinh do, trinh hoa, trinh co
viec cam » viec lam, viec cua, viec va
dang tay » dang xay, dung tay, dan tay
doc cua » hoc cua, doi cua, do cua
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
xuc va » tuc va, luc va, xac 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 dang tay hoi. nhieu viec cam ((xuc va) OR (duc va)) trinh doc 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 cam ((xuc va) OR (duc va)) trinh doc cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (so sach)) ky dang tay hoi. nhieu viec cam ((xuc va) OR (duc va)) trinh doc cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky dang tay hoi. nhieu viec cam ((xuc va) OR (duc va)) trinh doc cua tre*.