Perhaps you should try some spelling variations:
duoc ban » duc ban, quoc ban, buoc ban
ban hanh » ban hang
ky trang » ke trang, ky trong, ky tang
trang xa » trang va, trang ha, trong xa
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
cua viet » ca viet, hoa viet, cua vat
cuu tre » cau tren, cau treo
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van lam » van nam
cua tre » cua te, cua triet, dua tren

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 trang xa hoi. hieu van lam duoc ban hanh vi ((cua viet) or (((cuu tre) or (cua tre))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky trang xa hoi. hieu van lam duoc ban hanh vi ((cua viet) OR (((cuu tre) OR (cua tre)))).
• Adding a wildcard symbol may retrieve word variants: tu sach ky trang xa hoi. hieu van lam duoc ban hanh vi ((cua viet) or (((cuu tre) or (cua tre))))*.