Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
tham thuc » nham thuc, pham thuc, tam thuc
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
sach ky » sac ky, sach ty, sach kem
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
va tham » van tham, va cham, va thanh
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: thu ((sach ky) or (sach y)) nang ma hoi. hieu va tham thuc va hanh vi ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) nang ma hoi. hieu va tham thuc va hanh vi ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach y)) nang ma hoi. hieu va tham thuc va hanh vi ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach y)) nang ma hoi. hieu va tham thuc va hanh vi ((cua triet) OR (su triet))*.