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
cau duc » cao duc, cau luc, chu duc
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
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: tu ((sach ky) or (sach ty)) nang o hoi. hieu va cau duc va thanh lam ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang o hoi. hieu va cau duc va thanh lam ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) nang o hoi. hieu va cau duc va thanh lam ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang o hoi. hieu va cau duc va thanh lam ((cua triet) OR (cua viet))*.