Perhaps you should try some spelling variations:
sach tham » sach nha
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, cach thuc
dinh vi » dinh ve, dinh viet, dinh tri
xa dinh » xac dinh, va dinh, ba dinh
dau tuc » dau tu, dao tuc, cau truc
cuu tre » cua tre, cau tren, cau treo
van dau » van dao, phan dau
van hoe » van hoc, van hieu, van hien
vi cuu » vi luu, vinh cuu

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 thu) or (sach tham)) thang ((van hoe) OR (van hoa)). hieu van dau tuc xa dinh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach tham)) thang ((van hoe) OR (van hoa)). hieu van dau tuc xa dinh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) or (sach tham)) thang ((van hoe) OR (van hoa)). hieu van dau tuc xa dinh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach tham)) thang ((van hoe) OR (van hoa)). hieu van dau tuc xa dinh vi cuu tre*.