Perhaps you should try some spelling variations:
thanh vang » thanh van, thanh hang, thanh hoang
ban thanh » ban hanh, ban hang
vang cua » mang cua, hang cua, tang cua
hieu van » thien van, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
cam qua » cau qua, cac qua, cay qua
qua ban » cua ban, qua quan
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang

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) or (ky tang)) ma hoa. ((hieu van) OR (hieu va)) cam qua ban thanh vang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (ky tang)) ma hoa. ((hieu van) OR (hieu va)) cam qua ban thanh vang cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) or (ky tang)) ma hoa. ((hieu van) OR (hieu va)) cam qua ban thanh vang cua tre*".