Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
than cua » nhan cua, thai cua, ban cua
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty sang » ty xang, ty hang, duy sang
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc 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 ty sang ((ma hoa) or (xa hoi)). hieu ve cac luc va hanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty sang ((ma hoa) OR (xa hoi)). hieu ve cac luc va hanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty sang ((ma hoa) or (xa hoi)). hieu ve cac luc va hanh than cua tre*.