Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
thanh ve » thanh va, thanh vien, thanh van
sach thu » sach thieu, sach tham, cach thuc
nam thuc » nam thuoc, am thuc, nam thu
thuc ban » thuoc ban, thuc dan, thu ban
hanh ve » hanh vi, hanh va, hanh kem
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay

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 thue)) lang xa hoi. hieu va nam thuc ban ((thanh ve) or (hanh ve)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thue)) lang xa hoi. hieu va nam thuc ban ((thanh ve) OR (hanh ve)) cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) OR (sach thue)) lang xa hoi. hieu va nam thuc ban ((thanh ve) or (hanh ve)) cua vat".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) OR (sach thue)) lang xa hoi. hieu va nam thuc ban ((thanh ve) or (hanh ve)) cua vat*.