Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
nang mai » nang tai, lang mai, nang cai
thanh vi » hanh vi, thanh va, thanh ve
tuc ban » thuc ban, truc ban, tu ban
su sach » so sach, vu sach
cam tuc » cam xuc, cam tu, nam thuc
nang ma » tang ma, sang ma, nang cao
va cam » va cham, va cac, va cao

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

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