Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
va triet » va thiet, ve triet, cua triet
hanh vu » hanh vi, hanh va, hanh tu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
xuc va » duc va, luc va, xac va

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 nang xa hoi. hieu van cham ((xuc va) or (tuc va)) hanh vu ((va triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van cham ((xuc va) OR (tuc va)) hanh vu ((va triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu van cham ((xuc va) or (tuc va)) hanh vu ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van cham ((xuc va) or (tuc va)) hanh vu ((va triet) OR (va trien))*.