Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
lam truc » lam truoc, nam truc, lam trung
su triet » su viet, su tien
ve triet » va trien
hieu van » hieu va, thien van, lieu va
han tai » hang tai, nhan tai, van tai
nang xa » nang x, lang xa, nang ma
san ky » sang ky, van ky, dan ky
va han » va phan, van han, va hanh
te san » te ban, ke san, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky nang xa hoi. hieu van ((lam truc) OR (lam thuoc)) va han tai ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky nang xa hoi. hieu van ((lam truc) OR (lam thuoc)) va han tai ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky nang xa hoi. hieu van ((lam truc) OR (lam thuoc)) va han tai ((su triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: te san ky nang xa hoi. hieu van ((lam truc) OR (lam thuoc)) va han tai ((su triet) or (ve triet))*.