Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
cuoc loc » cuoc doi, chon loc, cuoc o
trinh vi » trinh va, trinh ve, trinh van
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
dang xa » dang xay, lang xa, dang ha
ty dang » ty xang, ky dang, ty hang
cua tre » cua te, cuu tre, cua triet
loc va » hoc va, luc va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty dang xa hoi. ((hieu va) OR (hieu qua)) cuoc loc va ((trinh vi) OR (trinh viet)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty dang xa hoi. ((hieu va) OR (hieu qua)) cuoc loc va ((trinh vi) or (trinh viet)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ty dang xa hoi. ((hieu va) OR (hieu qua)) cuoc loc va ((trinh vi) or (trinh viet)) cua tre*.