Perhaps you should try some spelling variations:
kho tang » cao tang
hieu van » hieu va, thien van, hieu ve
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
ky tang » ky nang, ky dang, ky trong
dua ban » dia ban, cua ban, qua ban
vai cua » dai cua, hai cua, lai 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: tu sach ((ky tang) OR (kho tang)) ma hoa. ((hieu van) or (lieu va)) chay dua ban hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky tang) OR (kho tang)) ma hoa. ((hieu van) OR (lieu va)) chay dua ban hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky tang) OR (kho tang)) ma hoa. ((hieu van) or (lieu va)) chay dua ban hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky tang) OR (kho tang)) ma hoa. ((hieu van) or (lieu va)) chay dua ban hanh vai cua tre*.