Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
kho tang » cao tang
thanh ha » thanh hoa, thanh hai, nhanh ha
te sach » toc sach
ky tang » ky nang, ky trong, tay tang
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
ha cua » hoa cua, hai cua, nha 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) OR (kho tang))) or (ky dang)) xa hoi. hieu va cac duc ban thanh ha cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((((ky tang) OR (kho tang))) OR (ky dang)) xa hoi. hieu va cac duc ban thanh ha cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((((ky tang) OR (kho tang))) or (ky dang)) xa hoi. hieu va cac duc ban thanh ha cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((((ky tang) OR (kho tang))) or (ky dang)) xa hoi. hieu va cac duc ban thanh ha cua triet*.