Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh doi » thanh loi, thanh moi, thanh do
kho tang » cao tang
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
hieu va » lieu va, hieu qua
lam cuu » lam chu, lam cua, cham cuu
cuu ban » cuu van, cua ban, cuu san
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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 ((kho tang) or (ky nang)) xa hoi. ((hieu van) OR (hieu va)) lam cuu ban thanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((kho tang) OR (ky nang)) xa hoi. ((hieu van) OR (hieu va)) lam cuu ban thanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((kho tang) or (ky nang)) xa hoi. ((hieu van) OR (hieu va)) lam cuu ban thanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((kho tang) or (ky nang)) xa hoi. ((hieu van) OR (hieu va)) lam cuu ban thanh doi cua tre*.