Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
cua triet » cua viet, su triet
hanh lam » thanh lap, hanh kem, hanh va
thuoc va » thuc va, thuoc ma, thuong va
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
nang hoa » nang hoat, hang hoa, nang hoc
hoa hoi » khoa hoi, hoa hoc, hoa doi
sach ky » sac ky, sach ty, sach kem
va hanh » van hanh, va thanh, va danh

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 (sach y)) nang hoa hoi. hieu van nam thuoc va hanh lam ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang hoa hoi. hieu van nam thuoc va hanh lam ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) nang hoa hoi. hieu van nam thuoc va hanh lam ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) nang hoa hoi. hieu van nam thuoc va hanh lam ((cua triet) or (va triet))*.