Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hang » ngan hang
cac duc » cac du, cao duc, cac dac
vai cua » dai cua, hai cua, lai cua
so sang » so sanh, so dang, so lang
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sang ((ky lang) OR (ky dang)) xa hoi. hieu ve cac duc ((ban hanh) or (ban hang)) vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sang ((ky lang) OR (ky dang)) xa hoi. hieu ve cac duc ((ban hanh) OR (ban hang)) vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sang ((ky lang) OR (ky dang)) xa hoi. hieu ve cac duc ((ban hanh) or (ban hang)) vai cua triet".
• Adding a wildcard symbol may retrieve word variants: so sang ((ky lang) OR (ky dang)) xa hoi. hieu ve cac duc ((ban hanh) or (ban hang)) vai cua triet*.