Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
nhan cua » nhat cua, nhan luc, nhan su
phan cua » than cua, phat cua, han cua
trang xa » trang va, trang ha, trong xa
su sach » so sach, vu sach
duc ban » duc tan, duc van, dua ban
sach ky » sac ky, sach y, sach ty
tang xa » tang ma, lang xa, tang ha
v pham » vi pham, d pham
hieu v » hieu va, hieu ve, hieu 2

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((tang xa) or (trang xa)) hoi. hieu v pham duc ban thanh ((phan cua) OR (nhan cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((tang xa) OR (trang xa)) hoi. hieu v pham duc ban thanh ((phan cua) OR (nhan cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((tang xa) or (trang xa)) hoi. hieu v pham duc ban thanh ((phan cua) OR (nhan cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((tang xa) or (trang xa)) hoi. hieu v pham duc ban thanh ((phan cua) OR (nhan cua)) tre*.