Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » thien van, lieu va, hieu ve
thanh de » hanh de, thanh ve, thanh do
luc ban » duc ban, cuc ban, luc bat
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
su sach » vu sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu 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)) ky lang xa hoi. ((hieu van) OR (hieu va)) cac luc ban thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky lang xa hoi. ((hieu van) OR (hieu va)) cac luc ban thanh de cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky lang xa hoi. ((hieu van) OR (hieu va)) cac luc ban thanh de cua tre*".