Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
danh dau » lanh dao, hang dau, danh tu
danh sai » dung sai, danh bat, hanh san
cac duc » cac du, cao duc, cac dac
tu sach » thu sach, su sach, te sach
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: tu sach ((ky lang) or (ky dang)) xa hoi. hieu ve cac duc va ((danh sai) OR (danh dau)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky dang)) xa hoi. hieu ve cac duc va ((danh sai) OR (danh dau)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) or (ky dang)) xa hoi. hieu ve cac duc va ((danh sai) OR (danh dau)) va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky dang)) xa hoi. hieu ve cac duc va ((danh sai) OR (danh dau)) va triet*.