Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
dang mai » dang hai, dang mau, dang bai
cua tre » cuu tre, cua triet, dua tren
tu sach » su sach, te sach, tu cach
mai hoa » mai khoa, ma hoa, dai hoa
ky dang » ky nang, ky danh
van ca » van cau, van cua, dan ca
da ban » dia ban, dua ban, day ban
cua te » cua tu
ca da » ca dao, ca dan, ca dam

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)) ky dang mai hoa. hieu van ca da ban thanh phan ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky dang mai hoa. hieu van ca da ban thanh phan ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky dang mai hoa. hieu van ca da ban thanh phan ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky dang mai hoa. hieu van ca da ban thanh phan ((cua tre) or (cua te))*.