Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cau tren » cu tren, dau tren, ca tren
thu sach » thuat sach, thuoc sach, thu hoach
danh vai » danh sai, danh va, dang van
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
xang xa » lang xa, mang xa, ang xa
cac xuc » cam xuc, cac nuoc, chat xuc
xuc va » duc va, tuc va, luc va
ve cac » va cac, vien cac

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) or (thu sach)) ty xang xa hoi. hieu ve cac xuc va ((danh vai) or (doanh van)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty xang xa hoi. hieu ve cac xuc va ((danh vai) OR (doanh van)) cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ty xang xa hoi. hieu ve cac xuc va ((danh vai) or (doanh van)) cau tren*.