Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((ma hoi) OR (ma hoa)). hieu ve cac duc va thanh dat ((cuu tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((ma hoi) OR (ma hoa)). hieu ve cac duc va thanh dat ((cuu tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((ma hoi) OR (ma hoa)). hieu ve cac duc va thanh dat ((cuu tre) or (cua triet))*.