Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thu nang » thi nang, thu hang, tho nang
thu bang » thu ban, thu hang, chu bang
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
va cham » va chat, va tham
hieu va » lieu va, hieu qua
cuu tre » cau tren, cau treo
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((thu nang) or (thu bang)) xa hoi. hieu va cham soc va doanh van ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thu nang) OR (thu bang)) xa hoi. hieu va cham soc va doanh van ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thu nang) or (thu bang)) xa hoi. hieu va cham soc va doanh van ((cua tre) OR (cuu tre))*".