Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sac ky, sach y, sach ty
nam cuc » nam cac, nam cua, nam thuc
cuc ban » cua ban, cac ban, cuu ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((mang may) or (nang cao)) hoi. hieu van nam cuc ban hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((mang may) OR (nang cao)) hoi. hieu van nam cuc ban hanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((mang may) or (nang cao)) hoi. hieu van nam cuc ban hanh dai cua triet*.