Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cac cac » cac cach, ca cac, cac bac
cac van » cac dan
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
5 hoi » o hoi

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 v nang ((5 hoi) or (xa hoi)). hieu va cac cac van thanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang ((5 hoi) OR (xa hoi)). hieu va cac cac van thanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang ((5 hoi) or (xa hoi)). hieu va cac cac van thanh dai cua triet*.