Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
vai cua » dai cua, hai cua, lai cua
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
ve bao » te bao, va bao
bo van » vo van, so van, do van
ve bac » ve cac, ve ban, he bac
x hoi » xa hoi, o hoi, x ho

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) or (sach ty)) nang x hoi. hieu ((ve bac) OR (ve bao)) bo van hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang x hoi. hieu ((ve bac) OR (ve bao)) bo van hanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) nang x hoi. hieu ((ve bac) OR (ve bao)) bo van hanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang x hoi. hieu ((ve bac) OR (ve bao)) bo van hanh vai cua triet*.