Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh do, thanh dinh
thanh de » hanh de, thanh ve, thanh do
thu sach » tu sach, thuat sach, thuoc sach
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
cua tre » cuu tre, cua triet, dua tren
va hoc » van hoc
hoc du » hoc duc, hoc dau, hoc dua
du van » duy van, duc van, tu van
xang x » nang x
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty xang x hoi. hieu va hoc du van ((thanh di) OR (thanh de)) ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang x hoi. hieu va hoc du van ((thanh di) OR (thanh de)) ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty xang x hoi. hieu va hoc du van ((thanh di) OR (thanh de)) ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang x hoi. hieu va hoc du van ((thanh di) OR (thanh de)) ((cua tre) or (cua te))*.