Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
cham duc » pham duc, cham soc, pham duy
va triet » va thiet, va trien, ve triet
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
xang ma » tang ma, nang ma, rang ma
va cham » va chat, va tham

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((xang ma) OR (sang ma)) hoi. hieu va cham duc va hanh tai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((xang ma) OR (sang ma)) hoi. hieu va cham duc va hanh tai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((xang ma) OR (sang ma)) hoi. hieu va cham duc va hanh tai ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((xang ma) OR (sang ma)) hoi. hieu va cham duc va hanh tai ((cua triet) or (va triet))*.