Perhaps you should try some spelling variations:
doanh luan » doanh nhan
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
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 ky nang ma hoi. hieu van cac xuc va ((doanh cua) or (doanh luan)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu van cac xuc va ((doanh cua) OR (doanh luan)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu van cac xuc va ((doanh cua) or (doanh luan)) cua tre*.