Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
ban hanh » ban hang
xuc ban » duc ban, cuc ban, quoc ban
ve cham » va cham, ve chat, vu cham
vu sach » vu bach, su sach, vu khach
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
va cam » va cham, va cac, va cao
vi cua » vai cua, di 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: vu sach ((ty nang) OR (ty hang)) x hoi. hieu ((ve cham) or (va cam)) xuc ban hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty nang) OR (ty hang)) x hoi. hieu ((ve cham) OR (va cam)) xuc ban hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ty nang) OR (ty hang)) x hoi. hieu ((ve cham) or (va cam)) xuc ban hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty nang) OR (ty hang)) x hoi. hieu ((ve cham) or (va cam)) xuc ban hanh vi cua viet*.