Perhaps you should try some spelling variations:
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
hieu van » hieu va, thien van, lieu va
nam duoc » nam thuoc, da duoc, dat duoc
duoc van » duoc va, duc van, duoc ban
van nang » van quang, van ban, van dong
chua tre » chua tri, cua tre, chua trieu
lang xa » lang ha, dang xay, lang van
nang ca » nang cao, nang cap, nang cai
ca chua » ca cua, sua chua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach thu) or (sach tham)) lang xa hoi. hieu van nam duoc van nang ca chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach tham)) lang xa hoi. hieu van nam duoc van nang ca chua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach tham)) lang xa hoi. hieu van nam duoc van nang ca chua tre*.