Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
danh vai » danh sai, danh va, dang van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang ha » long ha
nang xa » nang x, lang xa, nang ma
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: tu sach ky ((nang xa) or (lang ha)) hoi. hieu ve 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 ky ((nang xa) OR (lang ha)) hoi. hieu ve 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 ky ((nang xa) or (lang ha)) hoi. hieu ve cam xuc va ((danh vai) OR (doanh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (lang ha)) hoi. hieu ve cam xuc va ((danh vai) OR (doanh van)) cua tre*.