Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
vay doanh » ly doanh, voi doanh, von doanh
te sach » toc sach
cac bac » cac bai, cac ban, cac cach
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
cac tac » cac toc, cac dac, cac tai
hieu ve » hieu va, hieu van
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
ha hoi » hoa hoi, ha noi, xa hoi

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 dang ha hoi. hieu ve ((cac tac) or (cac bac)) ((vay doanh) OR (van doanh)) van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ha hoi. hieu ve ((cac tac) OR (cac bac)) ((vay doanh) OR (van doanh)) van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ha hoi. hieu ve ((cac tac) or (cac bac)) ((vay doanh) OR (van doanh)) van cua tre*".