Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
tham luc » than luc, tham nuoc, tham thuc
hanh vai » hanh vi, hanh va, hanh tai
sang tao » hang tai
ban hanh » ban hang
luc ban » duc ban, cuc ban, luc bat
tu sach » thu sach, su sach, te sach
va tham » van tham, va cham, va thanh
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, mang may
hieu va » lieu va, hieu qua

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 ((sang ma) OR (sang tao)) hoi. hieu va tham luc ban hanh vai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((sang ma) OR (sang tao)) hoi. hieu va tham luc ban hanh vai ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((sang ma) OR (sang tao)) hoi. hieu va tham luc ban hanh vai ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((sang ma) OR (sang tao)) hoi. hieu va tham luc ban hanh vai ((cua triet) or (cua viet))*.