Perhaps you should try some spelling variations:
than cua » nhan cua, thai cua, ban cua
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va danh, ban hanh
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
ty sang » ty xang, ty hang, duy sang
cua tre » cua te, cuu tre, cua triet
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: tu sach ty sang ((ma hoa) or (xa hoi)). hieu ve cac luc ((va hanh) OR (va thanh)) 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) OR (va thanh)) than cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty sang ((ma hoa) or (xa hoi)). hieu ve cac luc ((va hanh) OR (va thanh)) 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) OR (va thanh)) than cua tre*.