Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
pham thuc » phap thuc, pham chuc, nham thuc
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
sang ma » tang ma, sang tao, mang may
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, nang cao, mang may
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
sach tu » sach thu, cach tu, sach ty
vai cua » dai cua, hai cua, lai cua

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 ky) or (sach tu)) ((nang ma) or (sang ma)) hoi. hieu va pham thuc van hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach tu)) ((nang ma) OR (sang ma)) hoi. hieu va pham thuc van hanh vai cua triet.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach tu)) ((nang ma) or (sang ma)) hoi. hieu va pham thuc van hanh vai cua triet*.