Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cac xuc » cam xuc, cac nuoc, chat xuc
van cac » van hac, van cau, van bac
mang xa » lang xa, mang may, dang xay
xang xa » lang xa, ang xa, dang xay
cuu tre » cau tren, cau treo
xuc va » duc va, tuc va, luc va

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 thu ((xang xa) or (mang xa)) hoi. hieu van cac xuc va danh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((xang xa) OR (mang xa)) hoi. hieu van cac xuc va danh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach thu ((xang xa) or (mang xa)) hoi. hieu van cac xuc va danh vi ((cua tre) or (cuu tre))*.