Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
thanh ha » thanh hoa, thanh hai, nhanh ha
cam tuc » cam tu, nam thuc, dam thuc
sach ty » sach y, sach tu, sach thu
so sach » so sanh, bo sach, co sach
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
hieu ve » hieu va, hieu van
ha cua » hoa cua, hai cua, nha cua

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

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