Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
trinh dai » trinh tai, trinh di, trinh da
tu sach » thu sach, su sach, te sach
ky dang » ky danh
viec va » vien va, viec cua, viec lam
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc 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 ((ky dang) or (ky nang)) xa hoi. nhieu viec va ((xuc va) OR (luc va)) trinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky dang) OR (ky nang)) xa hoi. nhieu viec va ((xuc va) OR (luc va)) trinh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky dang) or (ky nang)) xa hoi. nhieu viec va ((xuc va) OR (luc va)) trinh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) or (ky nang)) xa hoi. nhieu viec va ((xuc va) OR (luc va)) trinh dai cua tre*.