Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
sach tu » cach tu, sach ty, sach uu
hieu vi » hieu voi, hieu va, hieu ve
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
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: doc ((sach tu) or (sach thu)) nang x hoi. hieu vi pham thuc va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach tu) OR (sach thu)) nang x hoi. hieu vi pham thuc va hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: doc ((sach tu) or (sach thu)) nang x hoi. hieu vi pham thuc va hanh vi cua triet*.