Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thuc van » thuc vat, thuc dan, thuc va
va triet » va thiet, va trien, ve triet
thanh di » thanh doi, thanh de, thanh do
nam thuc » nam thuoc, am thuc, nam thu
su viet » so viet
nang ho » nang hoc, nang co, nang cao
tang ho » tang cho, tung ho, tang ha
hieu va » lieu va, hieu qua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang ho) OR (tang ho)) hoi. hieu va nam thuc van thanh di ((va triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang ho) OR (tang ho)) hoi. hieu va nam thuc van thanh di ((va triet) OR (su viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang ho) OR (tang ho)) hoi. hieu va nam thuc van thanh di ((va triet) or (su viet))*".