Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
doanh van » doan van, doanh va, doanh ban
thuc van » thuc vat, thuc dan, thuc va
su sach » vu sach
van cua » vang cua, ban cua, dan cua
so sach » so sanh, bo sach, co sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
ve nam » va nam, le nam, te nam
he nam » ha nam, nghe nam
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: ((su sach) OR (so sach)) ky tang ma hoa. hieu ((ve nam) or (he nam)) thuc van doanh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky tang ma hoa. hieu ((ve nam) OR (he nam)) thuc van doanh van cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky tang ma hoa. hieu ((ve nam) or (he nam)) thuc van doanh van cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky tang ma hoa. hieu ((ve nam) or (he nam)) thuc van doanh van cua te*.