Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
sach dao » lanh dao
dao tang » dao trang, cao tang, dam tang
tu sach » thu sach, su sach, te sach
van cua » vang cua, ban cua, dan cua
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach dao tang ma hoa. ((hieu ve) or (hieu qua)) cam ((xuc va) or (tuc va)) doanh van cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach dao tang ma hoa. ((hieu ve) OR (hieu qua)) cam ((xuc va) OR (tuc va)) doanh van cua tu.
• Adding a wildcard symbol may retrieve word variants: tu sach dao tang ma hoa. ((hieu ve) or (hieu qua)) cam ((xuc va) or (tuc va)) doanh van cua tu*.