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