Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
yu hang » yu zhang, yu pang, thu hang
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
yu wang » yun wang, yi wang, yu pang
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
x hoi » xa hoi, o hoi, x ho

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 ((yu wang) OR (yu hang)) x hoi. hieu van cac duc va thanh dai ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((yu wang) OR (yu hang)) x hoi. hieu van cac duc va thanh dai ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: te sach ((yu wang) OR (yu hang)) x hoi. hieu van cac duc va thanh dai ((cua tre) or (cua triet))*.