Perhaps you should try some spelling variations:
doanh qua » doanh quan, doanh cua, danh qua
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
qua cua » quan cua, quang cua, qua quan
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
me hoi » le hoi

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 ((me hoi) or (ma hoa)). hieu va cac ((thuc va) or (thuc day)) doanh qua cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((me hoi) OR (ma hoa)). hieu va cac ((thuc va) OR (thuc day)) doanh qua cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((me hoi) or (ma hoa)). hieu va cac ((thuc va) or (thuc day)) doanh qua cua tre*.