Perhaps you should try some spelling variations:
ban thanh » ban hanh
ban hang » ngan hang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
lam xuc » lam duoc
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
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 ky sang ma hoa. hieu van ((lam xuc) or (cam xuc)) ((ban thanh) OR (ban hang)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ma hoa. hieu van ((lam xuc) OR (cam xuc)) ((ban thanh) OR (ban hang)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ma hoa. hieu van ((lam xuc) or (cam xuc)) ((ban thanh) OR (ban hang)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoa. hieu van ((lam xuc) or (cam xuc)) ((ban thanh) OR (ban hang)) vi cua tre*.