Perhaps you should try some spelling variations:
nhien viet » nhin viet, nghiep viet, trien viet
viet cam » viet cham, viet nam, viet ca
tinh di » tinh doi, trinh di, tinh da
tu sach » thu sach, su sach, tu cach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
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 (te sach)) ky dang xa hoi. nhien viet cam ((xuc va) OR (luc va)) tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky dang xa hoi. nhien viet cam ((xuc va) OR (luc va)) tinh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky dang xa hoi. nhien viet cam ((xuc va) OR (luc va)) tinh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky dang xa hoi. nhien viet cam ((xuc va) OR (luc va)) tinh di cua tre*.