Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thi hang » thi hanh, thi nang, thi hong
danh vai » danh sai, danh va, dang van
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
ty hang » ly hang, ty xang, thu hang
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty hang) or (thi hang)) xa hoi. hieu ve cam xuc va ((danh vai) OR (doanh van)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (thi hang)) xa hoi. hieu ve cam xuc va ((danh vai) OR (doanh van)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) or (thi hang)) xa hoi. hieu ve cam xuc va ((danh vai) OR (doanh van)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (thi hang)) xa hoi. hieu ve cam xuc va ((danh vai) OR (doanh van)) cuu tre*.