Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
va cham » va chat
va tham » van tham, va thanh, va thuat
hanh le » thanh le, hanh ve, hanh de
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
goc va » hoc va, doc va, uoc va
loc va » hoc va, luc va
le cua » ly cua
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. lieu ((va cham) OR (va tham)) ((goc va) or (loc va)) hanh le cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. lieu ((va cham) OR (va tham)) ((goc va) OR (loc va)) hanh le cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. lieu ((va cham) OR (va tham)) ((goc va) or (loc va)) hanh le cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. lieu ((va cham) OR (va tham)) ((goc va) or (loc va)) hanh le cua viet*.