Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
dang xay » dang van, van xay
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
van bac » van ban, van bao, van hac
mang xa » lang xa, mang may, mang cua
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 ((dang xay) or (mang xa)) hoi. hieu van bac xuc va thanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((dang xay) OR (mang xa)) hoi. hieu van bac xuc va thanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach thu ((dang xay) or (mang xa)) hoi. hieu van bac xuc va thanh vi ((cua tre) or (cuu tre))*.