Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
tan hanh » tan thanh, tang hanh, toan hanh
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
tu ban » thu ban, te ban
ban ky » van ky, dan ky

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

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