Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nang ma » tang ma, sang ma, nang cao
vai cua » dai cua, hai cua, lai cua
cac luc » cau luc, coc luc, cac cuoc
vu san » va san, vu ban
cua te » cua tu
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu san ky nang ma hoi. hieu viec ((cac luc) OR (cac nuoc)) ((ban hanh) or (van hanh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky nang ma hoi. hieu viec ((cac luc) OR (cac nuoc)) ((ban hanh) OR (van hanh)) vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu san ky nang ma hoi. hieu viec ((cac luc) OR (cac nuoc)) ((ban hanh) or (van hanh)) vai cua te*".