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