Perhaps you should try some spelling variations:
ban thanh » ban hang
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
dau xuc » dau xac, dau xua, dau nuoc
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
van dau » van dao, phan dau
hoa va » hoa van, hoa xa, hoa vo

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 ((nang xa) OR (nang x)) hoi. hieu van dau xuc ((ban thanh) or (ban hanh)) hoa va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. hieu van dau xuc ((ban thanh) OR (ban hanh)) hoa va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (nang x)) hoi. hieu van dau xuc ((ban thanh) or (ban hanh)) hoa va triet*".