Perhaps you should try some spelling variations:
sach tham » sach nha
tham nang » nham nang, tham lang, tham nhung
thuc day » thuc dan, thuc vat
te sach » toc sach
danh va » doanh va, hanh va, anh va
thuc va » thuc vat, thuc dan
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
va cua » va chua, via cua, ca cua

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: te sach tham nang xa hoi. ((hieu va) OR (hieu qua)) co ((thuc va) OR (thuc day)) danh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tham nang xa hoi. ((hieu va) or (hieu qua)) co ((thuc va) OR (thuc day)) danh va cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach tham nang xa hoi. ((hieu va) or (hieu qua)) co ((thuc va) OR (thuc day)) danh va cua tre*.