Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
trinh di » trinh do, trinh dien, trinh dinh
viec cam » viec lam, viec cua, viec va
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
tang xa » trang xa, tang ma, lang xa
ty tang » tay tang, ty xang, 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 tang xa hoi. nhieu viec cam ((xuc va) or (tuc va)) trinh di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty tang xa hoi. nhieu viec cam ((xuc va) OR (tuc va)) trinh di ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty tang xa hoi. nhieu viec cam ((xuc va) or (tuc va)) trinh di ((cua tre) or (cuu tre))*.