Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
ban hanh » ban hang
dang cay » dang xay, dang ca, dung cay
dang cac » dung cac, bang cac, dong cac
van hanh » van thanh, van anh, van ban
viec cac » vien cac, viec cua, viec lam
vai cua » dai cua, hai cua, lai cua
cac luc » cau luc, coc luc, cac nuoc
vu san » va san, vu ban
san ky » sang ky, van ky, dan ky
cua te » cua tu

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 ((dang cay) OR (dang cac)) phoi. hieu viec cac luc ((ban hanh) or (van hanh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky ((dang cay) OR (dang cac)) phoi. hieu viec cac luc ((ban hanh) OR (van hanh)) vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu san ky ((dang cay) OR (dang cac)) phoi. hieu viec cac luc ((ban hanh) or (van hanh)) vai cua te*".