Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
nuoc sach » nguoi sach, cuoc cach, cuon sach
hoc sach » hoc sinh, hoc anh
hieu cua » hieu qua, dieu cua, bieu cua
hoc cac » hoc cao
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
ca viet » va viet, co viet, hoa viet
cac lo » cac lop, cac co, cac bo
lo ban » co ban, lo van, ly ban
tai ca » tai cac, tai cao, tai cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nuoc sach) or (((hoc sach) OR (hoc cac)))) ty hang xa hoi. hieu cua cac lo ban doanh tai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nuoc sach) OR (((hoc sach) OR (hoc cac)))) ty hang xa hoi. hieu cua cac lo ban doanh tai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nuoc sach) or (((hoc sach) OR (hoc cac)))) ty hang xa hoi. hieu cua cac lo ban doanh tai ca viet".
• Adding a wildcard symbol may retrieve word variants: ((nuoc sach) or (((hoc sach) OR (hoc cac)))) ty hang xa hoi. hieu cua cac lo ban doanh tai ca viet*.