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
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
ve cac » va cac, vien cac
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sai ky)) ((nang ma) OR (sang ma)) hoi. hieu ve cac lo van hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sai ky)) ((nang ma) OR (sang ma)) hoi. hieu ve cac lo van hanh vai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sai ky)) ((nang ma) OR (sang ma)) hoi. hieu ve cac lo van hanh vai cua triet*".