Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
nam thuoc » nam thuc, nam thu, nha thuoc
thu sach » tu sach, thuat sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
lam xuc » cam xuc, lam duoc
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa

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