Perhaps you should try some spelling variations:
thanh than » thanh thanh, thanh thang, thanh toan
ban thanh » ban hanh, ban hang
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
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 triet) OR (su 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 triet) OR (su 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 triet) OR (su 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 triet) OR (su triet))*.