Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nam thuc » nam thuoc, am thuc, nam thu
bach ky » bac ky
hieu he » hieu ve, hiem he, hieu le
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
he nam » ha nam, nghe nam
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach ky nang ((x hoi) OR (x ho)). hieu he nam thuc ((va hanh) or (va danh)) di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky nang ((x hoi) OR (x ho)). hieu he nam thuc ((va hanh) OR (va danh)) di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach ky nang ((x hoi) OR (x ho)). hieu he nam thuc ((va hanh) or (va danh)) di cua viet".
• Adding a wildcard symbol may retrieve word variants: vu bach ky nang ((x hoi) OR (x ho)). hieu he nam thuc ((va hanh) or (va danh)) di cua viet*.