Perhaps you should try some spelling variations:
ban hanh » ban hang
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
tang xa » trang xa, tang ma, tang ha
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
hanh va » hang va, hanh vi
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((tang xa) or (lang xa)) hoi. hieu va cac duc ban hanh va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((tang xa) OR (lang xa)) hoi. hieu va cac duc ban hanh va cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((tang xa) or (lang xa)) hoi. hieu va cac duc ban hanh va cua viet*.