Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
lang hoa » hang hoa, lang ha, nang hoa
su triet » su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
su viet » so viet
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang hoa hoi. hieu ve nam thuc va hanh vai ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang hoa hoi. hieu ve nam thuc va hanh vai ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang hoa hoi. hieu ve nam thuc va hanh vai ((su triet) or (su viet))*.