Perhaps you should try some spelling variations:
doanh van » doanh va, doanh ban, doanh nhan
danh vai » danh sai, danh va, dang van
doan van » doan va, hoang van, luan van
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
van cam » van nam, van lam, van cau
tang xa » trang xa, tang ma, lang xa
ty tang » tay tang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc 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 ty tang xa hoi. hieu van cam xuc va ((danh vai) or (((doanh van) OR (doan van)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty tang xa hoi. hieu van cam xuc va ((danh vai) OR (((doanh van) OR (doan van)))) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty tang xa hoi. hieu van cam xuc va ((danh vai) or (((doanh van) OR (doan van)))) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty tang xa hoi. hieu van cam xuc va ((danh vai) or (((doanh van) OR (doan van)))) cua tre*.