Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
hieu van » thien van, lieu va, hieu ve
thanh va » hanh va, thanh ha, thanh ve
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
bao duc » dao duc, bao luc, cao duc
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang

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 ty lang xa hoi. ((hieu van) OR (hieu va)) bao duc va ((thanh va) or (thanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty lang xa hoi. ((hieu van) OR (hieu va)) bao duc va ((thanh va) OR (thanh van)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty lang xa hoi. ((hieu van) OR (hieu va)) bao duc va ((thanh va) or (thanh van)) cua tre*".