Perhaps you should try some spelling variations:
dong hoc » dong co, dong luc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ho » nang hoc, nang co, tang ho
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
anh di » danh di, xanh di, anh du

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 ho) or (dong hoc)) hai. hieu va cam xuc ban ((anh di) or (anh d)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ho) OR (dong hoc)) hai. hieu va cam xuc ban ((anh di) OR (anh d)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ho) or (dong hoc)) hai. hieu va cam xuc ban ((anh di) or (anh d)) cuu tre*.