Perhaps you should try some spelling variations:
nhien viet » nhin viet, nghiep viet, trien viet
viet cam » viet cham, viet nam, viet ca
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
va tinh » may tinh
tinh da » tinh va, tinh gia, tinh lao
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
xuc va » duc va, tuc va, luc 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 lang) or (ky nang)) xa hoi. nhien viet cam xuc va tinh da ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. nhien viet cam xuc va tinh da ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. nhien viet cam xuc va tinh da ((cua tre) or (cuu tre))*.