Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nham thu, pham thuc
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
vi cua » vai cua, di 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 ((sac ky) or (sach y)) nang ma hoa. hieu qua ((nham thuc) OR (nam thuc)) vat hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sac ky) OR (sach y)) nang ma hoa. hieu qua ((nham thuc) OR (nam thuc)) vat hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sac ky) or (sach y)) nang ma hoa. hieu qua ((nham thuc) OR (nam thuc)) vat hanh vi cua triet*".