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
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
ly nang » ky nang, ly hang, ly vang
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, v nang, may nang

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) OR (ly nang)) xa hoi. hieu van cac duc va thanh dat ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y nang) OR (ly nang)) xa hoi. hieu van cac duc va thanh dat ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) OR (ly nang)) xa hoi. hieu van cac duc va thanh dat ((cua tre) or (cua triet))*.