Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
than cua » thai cua, ban cua, gian cua
nhan cua » nhat cua, nhan luc, nhan su
ky tang » ky dang, kho tang, ky trong
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
duc ban » duc tan, duc van, dua ban
su sac » su sach, su cac, su xac

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

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