Perhaps you should try some spelling variations:
nam truc » nam truoc, nam thuc, nam trung
sach ly » sach y, sach lo, sach hay
dinh vi » dinh ve, dinh viet, dinh tri
danh vi » hanh vi, danh di, danh va
truc va » thuc va, thuc vat, trung va
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
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: su ((sach ly) or (sach ty)) lang xa hoi. hieu va nam truc va ((danh vi) OR (dinh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ly) OR (sach ty)) lang xa hoi. hieu va nam truc va ((danh vi) OR (dinh vi)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ly) or (sach ty)) lang xa hoi. hieu va nam truc va ((danh vi) OR (dinh vi)) cuu tre*".