Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van hac » van hoc, van ha, van hai
xuc van » duc van, luc van, xuc ban
lam cua » lam chat

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