Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
hanh dai » hanh tai, hanh dao, vanh dai
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
cau cuc » cau cua, cau luc, cau truc
cuc ban » cua ban, cac ban, cuu ban
y nang » ky nang, ly nang, v nang

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 y nang ma hoa. hieu van cau cuc ban hanh dai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoa. hieu van cau cuc ban hanh dai ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoa. hieu van cau cuc ban hanh dai ((cua triet) or (cua viet))*.