Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cham duc » pham duc, cham soc, pham duy
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van ban
van anh » van thanh, tuan anh, van minh
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu 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) OR (thu sach)) y nang x hoi. hieu ve 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) OR (thu sach)) y nang x hoi. hieu ve 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) OR (thu sach)) y nang x hoi. hieu ve cham duc ((van hanh) or (van anh)) lai va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang x hoi. hieu ve cham duc ((van hanh) or (van anh)) lai va triet*.