Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
va triet » va thiet, va trien, ve triet
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
su van » tu van, vu van
du va » dau va, tu va, su va

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: te sach y nang ma hoi. hieu ve cac ((du va) OR (su van)) thanh dat va triet~.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu ve cac ((du va) or (su van)) thanh dat va triet*.