Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham duc » pham duc, cham soc, pham duy
va thanh » gia thanh, ban thanh, va tinh
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va danh, ban hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, mang may
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: tu sach ky ((nang ma) OR (nang cao)) hoi. hieu va cham duc ((va hanh) or (va thanh)) lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (nang cao)) hoi. hieu va cham duc ((va hanh) OR (va thanh)) lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ma) OR (nang cao)) hoi. hieu va cham duc ((va hanh) or (va thanh)) lai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) OR (nang cao)) hoi. hieu va cham duc ((va hanh) or (va thanh)) lai cua triet*.