Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
duy sang » duy van, duy can, duy anh
lam duoc » nam duoc, luat duoc, lam thuoc
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
lam xuc » cam xuc
cua tre » cua te, cuu tre, cua triet
y sang » _ sang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y sang) OR (duy sang)) ma hoi. hieu van ((lam xuc) or (lam duoc)) ban thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y sang) OR (duy sang)) ma hoi. hieu van ((lam xuc) OR (lam duoc)) ban thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y sang) OR (duy sang)) ma hoi. hieu van ((lam xuc) or (lam duoc)) ban thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y sang) OR (duy sang)) ma hoi. hieu van ((lam xuc) or (lam duoc)) ban thanh vi cua tre*.