Perhaps you should try some spelling variations:
nhien viet » nhin viet, nghiep viet, dien viet
trien viet » tieng viet
tu sach » thu sach, su sach, tu cach
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
te sach » toc sach
tuc va » thuc va, truc va, tuc xa
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) OR (trien viet)) cam tuc 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) OR (trien viet)) cam tuc 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) OR (trien viet)) cam tuc va tinh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky dang xa hoi. ((nhien viet) OR (trien viet)) cam tuc va tinh di cua tre*.