Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thach duc » thach thuc, than duc, thinh duc
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hac duc » hoc duc, ha duc, pham duc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
co cua » con cua, cong cua, cuoi 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 lang xa hoi. hieu van ((hac duc) OR (thach duc)) ban thanh ((ca cua) or (co cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu van ((hac duc) OR (thach duc)) ban thanh ((ca cua) OR (co cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu van ((hac duc) OR (thach duc)) ban thanh ((ca cua) or (co cua)) triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu van ((hac duc) OR (thach duc)) ban thanh ((ca cua) or (co cua)) triet*.