Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
thu sach » thuat sach, thuoc sach, thu hoach
viec cam » viec lam, viec cua, viec va
dang xay » dang van, van xay
tinh di » tinh doi, trinh di, tinh da
tu sach » su sach, te sach, tu cach
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

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