Perhaps you should try some spelling variations:
sach thu » sach thue, sach tham, cach thuc
nam thuc » nam thuoc, am thuc, nam thu
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach thu) or (sach thieu)) lang xa hoi. hieu va nam thuc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach thu) OR (sach thieu)) lang xa hoi. hieu va nam thuc va hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach thu) or (sach thieu)) lang xa hoi. hieu va nam thuc va hanh va cua tre*.