Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, dua tren
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sac ky)) nang ma hoa. thien van nam thuc va hanh ve ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang ma hoa. thien van nam thuc va hanh ve ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang ma hoa. thien van nam thuc va hanh ve ((cua tre) or (cua triet))*.