Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
hieu vi » hieu voi, hieu va, hieu ve
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
ma hoi » mai hoi, xa hoi, ma hoa

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