Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
van chat » cao chat
ve chat » va chat
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
lam va » nam va, dam va, lam ha

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

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