Perhaps you should try some spelling variations:
thanh vang » thanh van, thanh hang, thanh hoang
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
vang cua » mang cua, hang cua, tang cua
qua ban » cua ban, qua quan
cam qua » cau qua, cac qua, cay qua
van cam » van nam, van lam, van cau
tu sach » thu sach, su sach, te sach
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
ky sang » ky nang, duy sang
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 sang) or (((ky tang) OR (ky dang)))) ma hoa. hieu van 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) OR (ky dang)))) ma hoa. hieu van 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) OR (ky dang)))) ma hoa. hieu van cam qua ban thanh vang cua tre*".