Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
sach ky » sach y, sach kem, sach hay
van cua » vang cua, ban cua, dan cua
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((((sach ky) OR (sach ty))) or (sac ky)) dang xa hoi. hieu ve cac tuc va doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((((sach ky) OR (sach ty))) OR (sac ky)) dang xa hoi. hieu ve cac tuc va doanh van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((((sach ky) OR (sach ty))) or (sac ky)) dang xa hoi. hieu ve cac tuc va doanh van cua tre*".