Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
van tai » von tai, van tuan
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
cuc va » chuc va, duc va, cuu va

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 y ((nang ma) or (dang xay)) hoi. hieu van tai cuc va hanh va ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ma) OR (dang xay)) hoi. hieu van tai cuc va hanh va ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ma) or (dang xay)) hoi. hieu van tai cuc va hanh va ((cua triet) or (cua viet))*.