Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
van cau » van dau, van chat, toan cau
van hau » van ha, van hai, van dau
tinh va » tich va, trinh van, tinh gia
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 hoi. hieu ((van cau) OR (van hau)) nuoc va ((tinh va) OR (trinh vat)) cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty xang xa hoi. hieu ((van cau) OR (van hau)) nuoc va ((tinh va) or (trinh vat)) cua tu~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang xa hoi. hieu ((van cau) OR (van hau)) nuoc va ((tinh va) or (trinh vat)) cua tu*.