Perhaps you should try some spelling variations:
doanh cua » doanh luan
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
danh ca » dan ca, danh cho, danh gia
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
tac va » tac da, tac xa, tuc 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 y nang ((le hoi) or (ma hoa)). hieu va cac tac va ((danh ca) or (doanh cua)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((le hoi) OR (ma hoa)). hieu va cac tac va ((danh ca) OR (doanh cua)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((le hoi) or (ma hoa)). hieu va cac tac va ((danh ca) or (doanh cua)) cua tre*.