Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cau nuoc » cap nuoc, cac nuoc, dau nuoc
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, dang xay
van cau » van dau, van hau, van chat
ang xa » lang xa, mang xa, dang xay
cua tu » cua tuc, cua su, cua cu

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: thu sach ty ((xang xa) OR (ang xa)) hoi. hieu van cau nuoc va ((tich va) OR (trinh vat)) cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((xang xa) OR (ang xa)) hoi. hieu van cau nuoc va ((tich va) or (trinh vat)) cua tu~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((xang xa) OR (ang xa)) hoi. hieu van cau nuoc va ((tich va) or (trinh vat)) cua tu*.