Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
cham duc » pham duc, cham soc, pham duy
su triet » su viet, su tien, ve triet
nang ma » tang ma, nang cao, mang may
sach ty » sach y, sach tu, sach thu
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
sang ma » tang ma, sang tao, 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: thu sach ty ((sang ma) OR (nang ma)) hoi. hieu va cham duc va hanh lai ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((sang ma) OR (nang ma)) hoi. hieu va cham duc va hanh lai ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((sang ma) OR (nang ma)) hoi. hieu va cham duc va hanh lai ((cua triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((sang ma) OR (nang ma)) hoi. hieu va cham duc va hanh lai ((cua triet) or (su triet))*.