Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
dien cac » vien cac, dien cuc, dien sach
va doanh » van doanh, vay doanh, va danh
vien dai » hien dai
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
lo va » lo van, lao va, ly va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu ((dien cac) OR (vien dai)) lo va doanh van cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang xa hoi. hieu ((dien cac) or (vien dai)) lo va doanh van cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu ((dien cac) or (vien dai)) lo va doanh van cua tre*.