Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
hieu ve » hieu va, hieu van
nang ma » tang ma, nang cao, mang may
van cua » vang cua, ban cua, dan cua
sang ma » tang ma, sang tao, mang may
duc vay » duc van, duc vy
te sac » te sach, te cac, te san
ve cao » va cao, ve bao, ve cac
sac ky » cac ky, sai 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: te sac ky ((nang ma) or (sang ma)) hoi. hieu ve cao ((duc vay) OR (duc va)) doanh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang ma) OR (sang ma)) hoi. hieu ve cao ((duc vay) OR (duc va)) doanh van cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang ma) or (sang ma)) hoi. hieu ve cao ((duc vay) OR (duc va)) doanh van cua te*".