Perhaps you should try some spelling variations:
cua triet » su triet, va triet
thanh lam » thanh lap, hanh lam, thanh nam
cua viet » ca viet, hoa viet, cua vat
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach ty, sach kem
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ky) OR (sach y)) nang o hoi. hieu van cam duc va thanh lam ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sach y)) nang o hoi. hieu van cam duc va thanh lam ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ky) OR (sach y)) nang o hoi. hieu van cam duc va thanh lam ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ky) OR (sach y)) nang o hoi. hieu van cam duc va thanh lam ((cua triet) or (cua viet))*.