Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
thu sach » tu sach, thuat sach, thuoc sach
vuc nang » cuc nang, vu nang, chuc nang
hieu van » hieu va, thien van, lieu va
va dinh » van dinh, va kinh, va tinh
dinh di » dinh du, dinh vi, danh di
te sach » toc sach
nam tuc » nam thuc, nam truc, nam tu
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) vuc nang x hoi. hieu van nam tuc va dinh di ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) vuc nang x hoi. hieu van nam tuc va dinh di ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) vuc nang x hoi. hieu van nam tuc va dinh di ((cua triet) or (va triet))*.