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

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

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