Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
hieu van » hieu va, thien van, lieu va
su sach » vu sach
van cam » van nam, van lam, van cau
dang ha » dong ha, dung ha, lang ha
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
y dang » ky dang, 2 dang, _ dang
tac va » tac da, tac xa, tuc va
di cua » dai cua, doi cua, de cua

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) or (so sach)) y dang ha hoi. hieu van cam ((tac va) or (tuc xa)) thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y dang ha hoi. hieu van cam ((tac va) OR (tuc xa)) thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y dang ha hoi. hieu van cam ((tac va) or (tuc xa)) thanh di cua tre*.