Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
nam thuc » nam thuoc, am thuc, nam thu
su triet » su viet, su tien, ve triet
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
nam tu » nam thu
vi su » va su, ve su, ki su

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 qua ((nam thuc) or (nam tu)) ((va hanh) or (van thanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang xa hoi. hieu qua ((nam thuc) OR (nam tu)) ((va hanh) OR (van thanh)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: te sac ky lang xa hoi. hieu qua ((nam thuc) or (nam tu)) ((va hanh) or (van thanh)) vi su triet*.