Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van ban
van anh » van thanh, tuan anh, van minh
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, ve chim
vu cham » va cham, vu kham, tu cham
y nang » ky nang, ly nang, v nang
lai va » loai va, mai va, dai va
x hoi » xa hoi, o hoi, x ho

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