Perhaps you should try some spelling variations:
dinh dien » tinh dien, kinh dien, dich dien
toc sach » hoc sach, doc sach, thuoc sach
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
va dinh » van dinh, va kinh, va tinh
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cai
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. hieu ((va cam) OR (va cao)) tuc va dinh dien ((cua te) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu ((va cam) OR (va cao)) tuc va dinh dien ((cua te) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. hieu ((va cam) OR (va cao)) tuc va dinh dien ((cua te) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu ((va cam) OR (va cao)) tuc va dinh dien ((cua te) or (va triet))*.