Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hoa » thanh pho
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
dac ban » cac ban, dac san, duc ban
cua tre » cua te, cua triet, dua tren
cac dac » cac dan, cac dai, cac bac
van cac » van hac, van cau, van bac
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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) or (thu sach)) y nang x hoi. hieu van cac dac ban thanh hoa ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang x hoi. hieu van cac dac ban thanh hoa ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang x hoi. hieu van cac dac ban thanh hoa ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang x hoi. hieu van cac dac ban thanh hoa ((cua tre) OR (cuu tre))*.