Perhaps you should try some spelling variations:
doanh cua » doanh luan
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cua cua » cua chua, ca cua, qua cua
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
tuc va » thuc va, duc va, thuc vat
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: te sach ky tang xa hoi. hieu ve cac ((((tuc va) OR (tuc xa))) or (truc va)) doanh cua cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang xa hoi. hieu ve cac ((((tuc va) OR (tuc xa))) OR (truc va)) doanh cua cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang xa hoi. hieu ve cac ((((tuc va) OR (tuc xa))) or (truc va)) doanh cua cua tre*".