Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
trinh vi » trinh va, trinh ve, trinh van
cuoc loc » cuoc doi, chon loc, cuoc o
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
dang ha » dong ha, dung ha, lang ha
dang xa » dang xay, lang xa, dang va
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.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((dang xa) OR (dang ha)) hoi. hieu va cuoc loc va ((trinh vi) or (trinh viet)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((dang xa) OR (dang ha)) hoi. hieu va 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) OR (dang ha)) hoi. hieu va cuoc loc va ((trinh vi) or (trinh viet)) cua tre*".