Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
lam duoc » nam duoc, luat duoc, lam thuoc
than cua » nhan cua, ban cua, gian cua
thai cua » tai cuc, tri cua, dai cua
duoc ban » duc ban, quoc ban, buoc ban
hieu van » hieu va, thien van, lieu va
van lam » van nam
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
cam ky » cao ky, cac ky
tu cam » tu cham, tu cac, tu nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu cam ky ((nang ma) OR (tang ma)) hoi. hieu van lam duoc ban thanh ((thai cua) or (than cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cam ky ((nang ma) OR (tang ma)) hoi. hieu van lam duoc ban thanh ((thai cua) OR (than cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cam ky ((nang ma) OR (tang ma)) hoi. hieu van lam duoc ban thanh ((thai cua) or (than cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu cam ky ((nang ma) OR (tang ma)) hoi. hieu van lam duoc ban thanh ((thai cua) or (than cua)) tre*.