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

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 va nang ca ((chua tre) OR (chua tri))~.
• 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 va nang ca ((chua tre) OR (chua tri)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thu) or (sach tham)) lang xa hoi. hieu van nam duoc va nang ca ((chua tre) OR (chua tri))".
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach tham)) lang xa hoi. hieu van nam duoc va nang ca ((chua tre) OR (chua tri))*.