Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
su triet » su tien, ve triet
su viet » so viet
va hanh » van hanh, va thanh, va danh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam
va han » va phan, van han, va hang

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

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