Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
danh va » doanh va, hanh va, anh va
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
va cham » va chat, va tham
sach lo » sach dao, sach doi, sach moi
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
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: su ((sach lo) OR (sach hoi)) lang xa hoi. hieu va cham ((thuc va) or (truc va)) danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach lo) OR (sach hoi)) lang xa hoi. hieu va cham ((thuc va) OR (truc va)) danh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach lo) OR (sach hoi)) lang xa hoi. hieu va cham ((thuc va) or (truc va)) danh va cua tre*".