Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
lai cua » dai cua, hai cua, lai chau
sach 2 » sach y

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 2 ((nang ma) or (sang ma)) hoa. hieu va cac duc van hanh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 2 ((nang ma) OR (sang ma)) hoa. hieu va cac duc van hanh lai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach 2 ((nang ma) or (sang ma)) hoa. hieu va cac duc van hanh lai cua triet*.