Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
dang cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
trinh di » trinh do, trinh dien, trinh dinh
tu sach » thu sach, su sach, te sach
tinh di » tinh doi, tinh da, tin di
cua tre » cua te, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
viec va » vien va, viec cua, viec lam
ky dang » ky nang, ky danh
cuu tre » cau tren, cau treo
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 ky dang cay phoi. nhieu viec va duc va ((tinh di) or (trinh di)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang cay phoi. nhieu viec va duc va ((tinh di) OR (trinh di)) ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang cay phoi. nhieu viec va duc va ((tinh di) or (trinh di)) ((cua tre) or (cuu tre))*.