Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
dang xay » dang van, van xay
tinh doi » trinh doc, trinh do, tinh hoc
viec lam » viec va
tu sach » thu sach, su sach, te sach
tinh di » trinh di, tinh da, tin di
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
tuc va » thuc va, truc va, tuc xa
xuc va » duc 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 ty dang xay hoi. nhieu viec lam ((xuc va) or (tuc va)) ((tinh di) OR (tinh doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty dang xay hoi. nhieu viec lam ((xuc va) OR (tuc va)) ((tinh di) OR (tinh doi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty dang xay hoi. nhieu viec lam ((xuc va) or (tuc va)) ((tinh di) OR (tinh doi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty dang xay hoi. nhieu viec lam ((xuc va) or (tuc va)) ((tinh di) OR (tinh doi)) cua tre*.