Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, pham thuc
su triet » su viet, su tien, ve triet
nham thu » nam thu, pham thu, nhan thuc
hanh ky » hanh kem
hanh ki » hanh vi, hanh kien, thanh kim
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
dang ma » dang mau, dang mam, dang mat
ty dang » ty xang, ky dang, ty hang
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: tu sach ty dang ma hoi. hieu va ((nham thuc) or (nham thu)) va ((hanh ki) or (hanh ky)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty dang ma hoi. hieu va ((nham thuc) OR (nham thu)) va ((hanh ki) OR (hanh ky)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty dang ma hoi. hieu va ((nham thuc) or (nham thu)) va ((hanh ki) or (hanh ky)) su triet*.