Perhaps you should try some spelling variations:
nang khoa » hang khoa, dang khoa, nang hoa
cua triet » cua viet, su triet, va triet
khoa hoi » khoan hoi, khoa hoc, khoa doi
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
hanh lam » thanh lap, hanh kem, hanh va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
thiet » thieu

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 nang khoa hoi. hieu van nam thuc va hanh lam ((cua triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang khoa hoi. hieu van nam thuc va hanh lam ((cua triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang khoa hoi. hieu van nam thuc va hanh lam ((cua triet) or (va thiet))*.