Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tap » thanh lap, thanh tai, thanh tay
cua triet » cua viet, su triet, va triet
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
tap cua » tap quan, tiep cua
su hai » su tai

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

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