Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
nang cai » nang cao, nang tai, nang can
nang cap » nang cao, nang cham, nang phap
cham luc » cham soc, nhan luc, cham cuu
than cua » nhan cua, thai cua, ban cua
cua viet » ca viet, hoa viet, cua vat
bach ky » bac ky
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va

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 cai) or (nang cap)) hoi. hieu va cham luc va hanh than cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky ((nang cai) OR (nang cap)) hoi. hieu va cham luc va hanh than cua viet.
• Adding a wildcard symbol may retrieve word variants: vu bach ky ((nang cai) or (nang cap)) hoi. hieu va cham luc va hanh than cua viet*.