Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thai hanh » thai thanh, thi hanh, thai hang
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
van cac » van hac, van cau, van bac
cac toc » cac toi, cac nuoc, cac thoi
hanh di » hanh vi, hanh de, hang di

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (bo sach)) ky nang x ho. hieu van cac toc thai hanh di ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) ky nang x ho. hieu van cac toc thai hanh di ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) ky nang x ho. hieu van cac toc thai hanh di ((cua triet) or (va triet))*.