Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
danh dai » danh di, danh sai, vanh dai
danh dau » lanh dao, hang dau, danh tu
van dam » van nam, van dao, van dau
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
van am » van nam, van lam, van ai
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang x hoi. hieu ((van am) or (van dam)) thuc va ((danh dai) OR (danh dau)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. hieu ((van am) OR (van dam)) thuc va ((danh dai) OR (danh dau)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu ((van am) or (van dam)) thuc va ((danh dai) OR (danh dau)) va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu ((van am) or (van dam)) thuc va ((danh dai) OR (danh dau)) va triet*.